100% compatible with CPAP machine Quick installation and easy to use Recommended 6-month replacement: It is advised to replace the filter and valve every 6 months Universal compatibility: Filter replacement kit features a precise design, fully 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 without risk of leakage Portable design: CPAP machine filters are compact, lightweight, and easy to carry, no need for a separate storage bag Material: Plastic Color: Grey Package contents: 6 x Filter 6 x Check Valve Assembly Only the above package content is included; other items are not included Note: Due to light reflection and differences in display screens, the color of the item in the image may vary slightly from the actual product. Measurement error allowance is +/- 1-3 cm