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GoodKnight 420G Traveler CPAP Machine Overview
The 420G is the size of two VHS video cassettes stacked on top of each other. It is the lightest CPAP on the market. Best of all, it is built to last and backed by a two-year manufacturer warranty which means that although it is a travel CPAP, you can plan on this little guy lasting as long as any other CPAP on the market. It is a great machine.
This model is no longer available. A suitable replacement for this machine is the AirStart 10 CPAP with Heated Humidifier. The AirStart 10 features a built-in heated humidifier that keeps your therapy from drying you out with pleasant, humidified air. This single-pressure device does not feature automatic pressure adjustments. For the auto-adjusting version please see the AirSense 10 with Heated Humidifier
Features
Specifications
Important Tips
Replacement Parts
Power
Videos
FAQs
Customer Reviews
The 420G will start the pressure out low and ramp it up over time so you don't get blown away. It also has a two-year manufacturer's warranty, just like the big guys.
Going overseas? It will operate on any electrical current between 100 and 240 VAC without any adjustments except for power adapters.
Camping or RVing? It runs off of a 12volt battery source with just cables, no inverter necessary. If you change altitudes during all that travel, the 420G changes the pressure automatically.
Even if you stay at home, the 420G is a solid every night CPAP. Be sure to get the H2O heated humidifier base for a healthier CPAP experience. No nasal irritation, sneezing, dryness or congestion. And we discount the combo to make it easy on your wallet. Optional disposable fine filters help, too.
If just feeling better isn't enough, and you want to actually see the results of your therapy, try upgrading to the 420S. This version will detect and record any residual snoring, apneas and hypopneas.
Need more? The 420 is also available in an auto-adjusting version, the 420E, which also records, but will also deliver your ideal pressure on a breath by breath basis. This means it will keep your airway open all night at the lowest possible effective pressure. You will feel the difference every single night!
Sound Level: 31-dB
Machine Dimensions: 5.8 in L x 5 in W x 3.9 in H
Machine Weight: 1.75
Machine Warranty: 2 Years
Default Machine Settings: 4-20cm H20
Humidification Available: Yes
Humidification Type: Integrated
Ramp Mode: Yes
DC Capable: Yes
Battery Option: Yes
Auto Altitude Adjustment: Yes
Good For: [object Object]
CPAP.com always offers these services
- 24 hour access to our CPAPtalk.com Support Forum
- Learning Center for information on sleep apnea and cpap equipment
- Consumer Purchasing Trends Reports
- Warranty Services for all items purchased through CPAP.com
- Insurance Compliant Invoices
- Free Prescription Request System
This small CPAP has been very popular because of the size and weight, especially as a second machine for travelers, but it can certainly be your 'every night' machine with as long a life expectancy as any other CPAP. It is a great product.
CPAP machines come with a six foot hose, a travel bag and manuals. Masks are not included and must be purchased separately. We will be happy to help you with sizing and offer suggestions on current popular masks.
The 420 line of machines can experience power problems when used with a Full Face Mask at pressures exceeding 15 CM/H2O. If you wish to use this mask configuration, please consider a different machine.
Error Note: If the machine displays an error 7 or "ER 7" this indicates an issue internally with the machine's blower. You can contact the provider of the machine to seek service if it is available, or the machine may need to be replaced.
Manufacturer Warranty
This machine comes with a 2 Year Manufacturer Warranty. CPAP.com will work with the manufacturer on your behalf if the machine needs repairs. Please follow these steps:
- Contact us at cpap@cpap.com or 1-800-356-5221 to receive an RMA (Return Merchandise Authorization) Number before returning the equipment
- Include a note with the machine describing the issue you are experiencing, along with your full contact information to include a return shipping address and the RMA number provided to you
- Ship only the defective items to CPAP.com at 13235 N Promenade Blvd Stafford, TX 77477
- Do not return accessory items such as the carry bag, hose or power cords
- Email updates will be sent to keep you informed as the machine moves through the warranty process
- CPAP.com will contact the manufacturer on your behalf and handle all shipping between us and the manufacturer
- The repaired or replaced unit will be returned to you. Shipping charges may apply.
Please note: The manufacturer warranty is voided by water damage or misuse of the machine.
The Goodknight Series operate automatically between 110v and 240v AC. When traveling either inside or outside the USA, there are no switches to switch or fuses to change. The machine will automatically sense what voltage is needed and set itself to run on the power needed.
The user will need to adapt the plug that goes into the wall to fit the style of outlet socket that is being used. This is simply done with a Power Adapter Plug kit. This is the same type of plug adapter that would be used with a hair dryer or an electric shaver. World Traveler Power Adapter Plugs.
GoodKnight Series DC Power Cord with Cigarette Lighter Adapter
The Goodknight series come equipped with a DC plug on the back of the unit. This allows the user to connect the CPAP to an external DC battery source. Using a Puritan Bennett, 12volt DC Power Cord, the GoodKnight 420 Series can be powered by plugging into a cigarette lighter plug. This is ideal for traveling by car, boat, or recreational vehicle that is equipped with a cigarette lighter plug.
The Freedom Travel CPAP Battery is currently the best battery on the market to power your GoodKnight Series machine. It makes a native connection without needing to buy an inverter or extra equipment to make it work. The Freedom is the next generation of the C-100 travel battery and is designed to work well with your GoodKnight Series Machine.
CPAP.com Battery Kit for GoodKnight 420 Series MachinesThe 2.5 lb CPAP.com Battery Pack is surprisingly small and lightweight. The lithium ion battery can be recharged at any discharge level without losing charge time due to battery memory loss. This battery has been approved by the United Nations and Department of Transportation as tested safe for travel. This battery kit comes with the CPAP.com battery and the GoodKnight 420 Series 12 Volt DC Power Cord.
Respironics Battery Kit for GoodKnight 420 Series
This portable battery pack is an external lead acid battery that is the ultimate in power, portability and convenience. This battery kit comes with the Respironics battery and the GoodKnight 420 Series 12 Volt DC Power Cord.
- CPAP Machine Comparison Guide. This guide stacks up every CPAP machine we sell, feature by feature. If you don't know the meaning of a feature, click the question mark for a definition. The links below will take you to the most popular CPAPs, or all CPAP machines we sell.
Compare Most Popular CPAP Machines
Compare All CPAP Machines
- Auto Adjusting Machine (APAP) Comparison Guide. This guide stacks up every APAP machine we sell, feature by feature. If you don't know the meaning of a feature, click the question mark for a definition. The links below will take you to the most popular APAPs, or all APAP machines we sell.
Compare Most Popular APAP Machines
Compare All APAP Machines
- BiPAP, VPAP and BiLevel Comparison Guide. This guide stacks up every BiPAP machine we sell, feature by feature. If you don't know the meaning of a feature, click the question mark for a definition. The links below will take you to the most popular BiPAPs, or all BiPAP machines we sell.
Compare Most Popular BiPAP Machines
Compare All BiPAP Machines
Any mask will work with any machine, with one important exception. The ResMed AirMini is only compatible with certain ResMed CPAP masks. Compatible masks for the AirMini are as follows:
- ResMed AirFit™ N20 Nasal Mask
- ResMed AirFit™ F20 Full Face
- ResMed AirTouch™ F20 Full Face
- ResMed AirFit™ P10 Nasal Pillow
When considering another CPAP, APAP or BiPAP machine from ResMed or any other manufacturer, mask compatibility extends to all brands. The AirMini uses non-standard tubing to connect the machine to the mask, and is the primary reason why other masks won't work with the AirMini. Despite this issue, many of our customers consider the AirMini to be an excellent machine.
- Calling a CPAP Expert Toll Free. 800.356.5221.
- Comparison Charts. These charts compare available machines, feature by feature. If you don't know the meaning of a feature, click on the question mark for a definition. Click on the image or name of the product for more detailed product information, pictures and resources.
Travel CPAP Comparison Chart
APAP Comparison Chart
BiPAP Comparison Chart
- Browse Our Machine Product Categories. These categories show each machine our company offers, ranked by popularity. Popularity is determined by a mix of sales data and our in house opinion of the quality of the machine based on our experience and customer feedback. The best products float to the top of our categories.
CPAP Machine Category
APAP (Auto Adjusting) Machine Category
BiPAP (Two Pressure) Machine Category
To see the list of what specifically comes with each machine, you can Browse for a machine. Then on the product page, click the "Specs" tab to see a full list of what comes with the machine.
Yes. Federal law requires we have a valid prescription on file before we ship your mask, machine, humidifier, or EPAP therapy, including Provent and Bongo RX. You will also need a prescription to purchase the Nightbalance POSA device.
We provide many easy ways to get your prescription:
- We can request your prescription for you! When you checkout, just let us know you would like us to request your prescription, or you can log into your account to have us request your prescription.
- Fax your prescription to our toll-free fax number: 866.353.2727, or our international fax number: 713.541.7377
- Email your prescription to cpap@cpap.com
- Upload your prescription in your account, under the Prescriptions Section
- Ask your doctor to fill out our prescription form. We have both a standard prescription form and an EPAP prescription form.
For more information on prescriptions, please see our Prescription Section of the Learning Center.
- A7034 is Nasal Mask
- A7034 is Nasal Pillow Mask
- A7030 is Full Face Mask
- A7027 is Hybrid Mask
- A7044 is Oral Interface Mask (Oracle)
- A7035 is Headgear for Mask - Any Style
- A7036 is Chinstrap - Any Style
- A7032 is Replacement Nasal Mask Cushion
- A7033 is Replacement Nasal pillows
- A7031 is Replacement Full Face Mask Cushion
- A7028 is Replacement Hybrid Mask Cushion
- A7029 is Replacement Hybrid Mask Nasal Pillow
- A7046 is Replacement Humidifier Chamber
- A7037 is Tubing / Hose - Long & Short Tubes
- A4604 is Heated Tubing
- A7038 is Disposable Filter (White / Paper)
- A7039 is Washable Filter (Gross Particle / Foam/ Black)
- E0601 NU is CPAP Purchase
- E0601 NU is APAP Purchase
- E0470 NU is BiPAP Purchase
- E0470 NU is BiPAP Auto Purchase
- E0471 NU is BiPAP ST Purchase
- E0471 NU is BiPAP Auto SV Purchase
- E0562 NU is Heated CPAP Humidifier
- E0561 NU is Passover or Cool CPAP Humidifier
- E0601 RR is CPAP Rental
- E0601 NU is APAP Rental
- E0470 RR is BiPAP Rental
- E0470 RR is BiPAP Auto Rental
- E0471 RR is BiPAP ST Rental
- E0471 RR is BiPAP Auto SV Rental
- E1356 is Oxygen Concentrator Battery
- E1357 is Oxygen Concentrator Battery Charger
- E1358 is Oxygen Concentrator DC Cable
- E1390 is Portable Oxygen Concentrator
E1399 is Miscellaneous and is used for other CPAP and Oxygen items.
Here are some other suggested actions to care for your machine:
- Keep the area around your machine clean by removing any dust from the area to improve the air quality delivered to your machine and to you.
- Keep the air intake of the machine unblocked. Curtains, bedding, and papers can easily block the air intake of your machine, reducing the airflow.
- If a humidifier is used with your therapy, do not pick up the machine with the humidifier attached. With most machines it is easy to spill water from the humidifier chamber into the machine causing damage. Manufacturer warranties are voided by water damage to the machine. To avoid this, remove the chamber from the humidifier and then remove the humidifier from the machine rather than transporting them together.
- If a humidifier is used, empty the water from the chamber every morning. Accidents happen. If a family pet or family member moves the machine and humidifier with water in the chamber it is more likely that water could be spilled into your machine. Water damage to a machine voids the manufacturer warranty.
Cleaning and changing filters is the only maintenance required for a CPAP machine.
The filters are located at the back of the machine at the air intake.
The following are the different types of exhalation relief names by manufacturer.
- Philips Respironics = C-Flex, C-Flex+, A-Flex and Bi-Flex
- Resmed = EPR (Expiratory Pressure Relief)
- 3B Medical = RESlex
- Apex Medical = PVA (Pressure Variation Algorithm) Pressure Relief
- Curative Medical = EUT (Expiratory Unloading Technology)
- DeVilbiss = SmartFlex
- Fisher & Paykel = SensAwake Technology
- Human Design Medical = Z-Breathe
- Somnetics = EZEX
Here are some machines with an exhalation relief feature:
Transcend Auto miniCPAP™ Machine with EZEX
PR System One REMStar 60 Series Auto with Bluetooth
AirSense™ 10 AutoSet CPAP Machine with HumidAir™ Heated Humidifier
+ See More
IMHO the decision to discontinue this machine was a big mistake. I have many thousands of hours on mine... and it just "keeps on ticking" (quietly) more...
5 years of daily use, not one issue. Excellent machine.
I have used this as a backup machine and did use it on the road when I was travelling a... lot. It's very easy to work with and I like it very much. It has a seperate resevoir for humidity which I thought might not be great but turned out to be handy. Some hotel rooms don't have outlets near the bed, or have just one. I found that with a moderate sized hose, I could improvise and use two outlets by seperating the machine from the humidity. Unintended but useful once or twice in a pinch. more...
I've been on cpap therapy since 2002 and I really like the GoodKnight 420G. This is the second one I've... purchased. I have traveled to Europe with it as well as around the States.It is easy to travel with-set-up, quiet,size,comfort and price. I also use it at home. more...
This is the second Goodnight 420G I've owned. I guess I didn't realize that it has been discontinued and... hope that's not a problem. I'm still using the first one for almost 3 years now and paid considerably more for it than I did for this one through CPAP.com so I really appreciate that......thanks....... more...
This is the machine I was first prescribed, and after 3 years of excellent results, it conked out, so... I was desperate to find another. A local medical supply company wanted to charge me more than a thousand dollars for the same machine, but cpap.com sold it to me for $300 -- and I got it the next day to my blessed relief! Thank you. more...
Very light and quiet. Perfect for travel. I got this machine for travel and as a back up for home,... but mostly using for home now since it is much quieter than the M series I have. more...
I bought the GoodKnight 420G after my 7 year old RemStar Plus conked out. I travel a lot for... my job and love the GoodKnight's compact size. It only takes up a small corner in my suitcase, and is small enough I can also slip it easily into my carry-on. I also use my GoodKnight 420G for daily use at home, and it is quite up to the job. The unit is very quiet, though it does telegraph slightly more noise down the tubing to my mask than the RemStar did. Cost of the unit was quite reasonable and is among the lower priced units available. Good things do indeed come in small packages. more...
The Goodnight 420 G with humidifier was recommended to me by a technician at my CPAP service provider as a... good travel machine. I've tested it at home before setting out on a trip to China. It is quiet and seems as well built as the Fisher & Paykel machine that I've used for 6 months. With the humidifier attached, it is almost as large as my original machine, but still smaller & lighter for travel. I may leave the humidifier behind and just use the machine when I want to travel really light. It gave off a funny plastic (new machine) smell for the first few nights, but this has dissipated. Overall it seems like a great machine for travel, or even for regular use in cramped spaces. more...
During an emergency shopping session from a sudden failure the night before of my fancy Remstar model with all the... bells and whistles (my first, and paid for with insurance) I settled on the GK420G. If price were no issue I probably would have purchased one of the newer smaller Remstar's because I was used to the brand. I'm very happy with my purchase, though. The GK420G is absolutely great. It comes packaged with a new hose (my old one is looking a little rough) on top of being about 1/3 the size of my old one. It has a clock, which is kind of unecessary, but nice. It takes a few seconds to ramp up to my full pressure -- but that just means I need to be in the habit of turning on my CPAP before I put on my mask, not the other way around. It's very quiet. It has a slightly different sound than my last machine, but is no louder, at all. Being younger and unmarried a quiet machine is pretty important for when I end up having a successful date. Even though I expected a machine that costs hundreds less to immediately seem lower quality I was amazed when I pulled it out of the box, and especially when I put it on to try it. It's only my second machine but I'm glad that this website allowed me to make an informed decision that kept the budget low and still gave me everything I need. more...
It works well
I have been using CPAP machine since 2001 and couldn't sleep without it. I have Remstar plus model which is... really good but the size of this machine is not quite small enough and take up too much space in my carry on bag. I bought this GoodKnight 420G and the size of this unit is amazingly small compare to my Remstar. I can even put this unit in my laptop carry on bag. The price for this unit is also very good about $200. The unit come with owner manual and manual on how to setup pressure on this machine. Well, I think I should review some things that I don't like about. The first thing I think would be the noise of this machine. It's not too loud but may be for some people because the noise is not constant wheezing but up and down when you are breathing. The second thing is that the unit has a seperated power supply adaptor. It would be better if build into the unit. The 3rd is the on/off button is harder to press on. All this three things were not bothered me too much for the price you pay for. I would recommend this unit to anyone! more...
