100% compatible with CPAP machine Quick install 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 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 without risk of leakage Easy to carry: CPAP machine filters are small, lightweight, and portable, 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 products are not included Note: Light reflection and different displays may cause slight color variation between the image and the actual item. Measurement allowance is +/- 1-3 cm