100% APPROPRIATE FOR CPAP MACHINE 2Quick install and easy to use Recommend 6 Month Replacement:It is advised to replace the filter and valve 6 months. Universal Compatibility: Filter Replacement Kit is using an exquisite design, perfectly compatible with SC1200 and SC2 machines, featuring the same effect as the . Convenient to Install: CPAP Filter Kit is used to replace old or broken filters, is easy to install without additional tools, and without risk of leakage. Easy Carrying: CPAP Machine Filters are no need to specially prepare a storage bag for , small, exquisite, lightweight, and easy to carry out at any time. Material: Plastic colour: grey Package Contents: 4 x Filter 4 x Check Valve Assembly Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.