This inlet and dry box seals are for the PR System One Humidifier (aka 50 series) and System One 60 series humidifier by Philips Respironics. The inlet seal connects the CPAP machine and the humidifier. The dry box seal connects the water chamber. The inlet prevents pesky water from slipping through potentially causing unnecessary unwarranted headaches with a potentially defective CPAP machine.
Included in your package:
(1) Dry Box and Inlet Seal