This check valve is completely serviceable and rebuild-able. The only sealing material is a Viton O-ring. This O-ring is easily replaceable is ever necessary. The body is one piece and requires no seal for the body. Only the O-ring is a sealing surface. This makes the CHK-SV check valve the most reliable check valve over the long term.
Kynar PVDF (polyvinylidene fluoride) is an ozone compatible material that has a cloudy off-white appearance. These fittings are known for being extremely durable and have outstanding aging resistance when used with ozone.