100% APPROPRIATE FOR CPAP MACHINE Quick install and easy to use Recommend 6 Month Replacement: It is advised to replace the filter and valve every 6 months. Universal Compatibility: Filter Replacement Kit features an exquisite design, perfectly compatible with SC1200 and SC2 machines, delivering the same performance as original. Convenient to Install: CPAP Filter Kit is designed to replace old or damaged filters, easy to install without additional tools, and ensures no risk of leakage. Easy Carrying: CPAP Machine Filters are small, lightweight, and portable, requiring no special storage bag for carrying. Material: Plastic Color: Grey Package Contents: 6 x Filter 6 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 to vary slightly from the real thing. The measurement allowed error is +/- 1-3 cm.