GoodKnight420E

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GoodKnight 420E Auto CPAP Machine

This is an auto-adjusting CPAP machine which is set for a range of pressures, then seeks out and delivers the lowest level of pressure needed to keep the airway open. The pressure level will vary as needed, but it will not lower with each exhalation as a bilevel does. The auto-adjusting CPAPs were designed for patients who are unable to participate in a sleep study or whose pressure needs vary during the night according to their stage of sleep or sleep position. However, any patient will receive very comfortable therapy from this type of CPAP.

Manufactured by Puritan Bennett.

Item #Y-GK420ENA

This product no longer available and this information is for reference only. Newer Model Available: Sandman Auto HC CPAP Machine with Built In Heated Humidifier.
Replacement Parts

Have a question? Call us!

1-800-356-5221(Mon-Fri 8AM-10PM CST, Sat 8AM-6PM CST)

CPAP Video & FAQ

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Frequently Asked Questions (FAQs)

How can I compare different machines?

We work very hard to provide many different ways for our customers to compare products. Here are the machine product guides we have created and maintain:

  • 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

Which CPAP masks work on which machines?

All CPAP masks work with all machines.

How do I choose the machine that is right for me?

We provide our customers with many tools to make informed decisions about their machine purchases. Options include:

  • Calling a CPAP Expert Toll Free. 1-800-356-5221.

  • 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.

    CPAP Comparison Chart

    APAP Comparison Chart

    BiPAP Comparison Chart

  • Help Me Choose Guide. We created a guide to help you select the right machine according to your preferences. The guide asks you a series of questions regarding your preferences and your prescription. Based on your answers we provide you with a comparison chart of the machine that meet your criteria. Get started here:

    Help Me Choose - Machine

  • 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

What comes with my machine?

Machines come with a six foot hose, power cord, at least one filter, and manuals. Most manufacturers include a carrying case which is designed specifically for their equipment. CPAP / BiPAP / APAP machines do not come with a delivery system or mask. CPAP Masks must be purchased separately.

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.

Are prescriptions required for mask, machine and/or humidifier purchases?

Yes. Federal law requires we have a valid prescription on file before we ship your mask, machine and/or humidifier.

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: 1-866-353-2727, or our international fax number: 713-541-7370
  • Email your prescription to cpap@cpap.com
  • Upload your prescription in your account, under the prescriptions section
For more information on prescriptions, please see our Prescription Section of the Learning Center.

What are the CPAP, BiPAP and Sleep Apnea related CPT or billing codes?

  • EO601 RR is CPAP Rental
  • E0601 NU is CPAP Purchase
  • A7034 is CPAP Mask
  • A7032 is CPAP Nasal mask cushion
  • A7033 is CPAP Nasal pillows
  • A7030 is CPAP Full face mask
  • A7031 is CPAP Full face mask cushion
  • A7044 is CPAP Oral interface
  • A7027 is CPAP Hybrid mask
  • A7028 is CPAP Hybrid mask cushion
  • A7029 is CPAP Hybrid mask nasal pillow
  • A7046 is CPAP Humidifier chamber
  • A7037 is CPAP Tubing, long and short hoses
  • A4604 is CPAP Heated tubing
  • A7038 is CPAP Disposable filter
  • A7039 is CPAP Gross particle (foam) filter
  • A7035 is CPAP Headgear
  • A7036 is CPAP Chinstrap
  • E0561 NU is CPAP Passover humidifier
  • E0562 NU is CPAP Heated humidifier
  • E0470 RR is BiPAP Rental
  • E0470 NU is BiPAP Purchase
  • E0471 RR is BiPAP-ST Rental
  • E0471 NU is BiPAP-ST Purchase

Other CPAP items are listed under E1399, which is miscellaneous.

What maintenance is required on machines?

The only care a CPAP or BiPAP machine requires is to clean or change the filters at the air intake. This keeps the internal parts from accumulating dust. Fine paper filters should be changed out every 30 days, or when they appear soiled. Foam washable filters should be rinsed with clear running water once a week, allowed to air dry, and reinserted.

There 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 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 you should 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.

What does CPAP therapy do?

CPAP therapy provides a constant airflow which holds the airway open so that uninterrupted breathing is maintained during sleep. It is traditionally provided through a nasal mask that seals around the nose to maintain the pressure level.

Do all CPAPs use filters?

Yes, all CPAPs use at least one filter that is usually a type of foam material and washable. Some CPAPs offer finer filtration with the addition of a disposable paper filter.

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 image below shows the black foam filter at the back of the Everest 3 CPAP Machine.

What is exhalation relief?

Exhalation relief is a comfort feature offered by two manufactures which reduces the air flow at the time of exhalation making the breathing process more natural.

  • Respironics = C-Flex, C-Flex+, A-Flex and Bi-Flex
  • Resmed = EPR (Expiratory Pressure Relief)

What is ramp?

The ramp button on a machine is a feature that allows for a gradual pressure build-up to your prescribed pressure. The feature is enjoyed by those with high pressures because they ease up to their pressure.

What data capable machines are available?

CPAP machines which record full data (such as AHI and leak info):


AUTOPAP ("Autotitrating CPAP" or "APAP") machines which record full data:


BILEVEL ("BiPAP") machines which record full data:


CPAP Machines that only record Compliance Data (Hours Used) are:

  • IntelliPAP Standard Travel CPAP Machine
  • PR System One REMstar DS150 CPAP Machine
  • PR System One REMstar Plus CPAP Machine with C-Flex
  • PR System One REMstar 60 Series Plus CPAP Machine with C-Flex
  • PR System One REMStar 60 Series SE CPAP Machine
  • S9 Escapeâ„¢ CPAP Machine with EPRâ„¢
  • SleepEasy II CPAP Machine with Built In Heated Humidifier and C-Flex
  • SleepStyle 234 CPAP Machine with Built In Heated Humidifier

    How do I change the pressure setting of my machine?

    When a physician orders a pressure change, or a patient moves to an area with a very different altitude and does not have an altitude compensating machine, there are a number of ways to ensure you are receiving CPAP therapy at the correct pressure.

    Sleep laboratories and sleep disorder centers may be willing to make this pressure change. Just call a big local hospital or ask you physician for sleep lab phone numbers. Be sure to take your prescription.

    A second way is to do it yourself. We sell manometers that are very portable, accurate, and simple to use. All the machines we sell come with instructions on how to set pressure to physician orders. Most patients have little trouble doing this themselves. If you need help we can talk you through the procedure.

    Gauge Manometer (for pressure measurements)

    Fisher and Paykel Water Column CPAP Manometer with HC325 Chamber

    A third option is to ship the machine to us with the new prescription. We will set it and ship it back.

    It is the law and good common sense to run all sleep disorder devices at the prescribed pressure. If you think your prescribed pressure is wrong, talk to your physician.

    How do I use a battery to operate my CPAP?

    First you need to determine if your machine is configured to operate on DC power and has a DC power outlet. If your machine does have a DC power outlet and you want to run your marine battery, then you will need the correct DC cable for your machine and an adapter cable that fits over the cigarette lighter plug and ends in alligator clips.

    CPAP.com sells complete battery kits with everything you need for your machine including the right cables for your machine and the battery. You can find the right battery kit for your machine here.

    If your machine does not have a DC power outlet, then you will also need an inverter to be able to run your machine on battery power.

    If you have questions about the specific power needs of your machine, review the "Power" tab on your machine's product page, or give us a call at 1-800-356-5221.

    Why might I prefer an APAP machine?

    Some CPAP users find it more pleasant to breathe with an APAP than with CPAP. The pressure delivered by an APAP machine automatically changes as needed to deliver the minimal pressure required to maintain the airway. The pressure delivered by a CPAP machine is set to a single pressure, the highest necessary to keep the airway open as determined during the sleep study. This is the case even when the higher pressure is needed only a fraction of the time.

    What does an APAP prescription need to say?

    • Contains one of the following words or phrases "APAP", "AutoPAP", "AutoSet", "Auto CPAP", "Auto Adjusting CPAP", "Self Adjusting CPAP", "CPAP" or "Continuous Positive Airway Pressure" or similar term.
    • Contains your physician's contact information
    • Contains your physician's signature
    • Contains the patient's full name
    • Contains your pressure range (Optional, Not Required)
      • Example: 4-20 CM/H20
      • Example: 4-20
      • Example: 6-18 CM/H2O
      • Example: 6-18
    CPAP prescriptions are accepted for Auto Adjusting (APAP) Machines.

    How do I prepare for power outages with CPAP?

    There are a lot of back up battery choices out there that can give you peace of mind in case of a power outage. The Transcend Travel CPAP Machine has Battery Options available for that can set up as a fail-over, back up battery. Review the "Power" Tab on the machine page.

    CPAP.com sells battery packs to accompany your machine if an integrated battery is not available. Visit CPAPtalk for more advice specific to your needs, or view this past thread on the topic here.

    Visit the Learning Center