Puritan Bennett H2O Heated Humidifier Coupling (coupler)
Manufactured by Puritan Bennett.
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"The original coupling was leaking. Replacing the coupling regularly will give the proper pressure and decrease noise. I'm on a 6 month reminder now."
"Works great... No problems/"
"right part right price"
"It works good."
"I highly recommend replacing this coupler more frequently than you might think. Over time, leakage WILL occur. I saw/heard immediate resolution when the part was replaced."