Features PREVENT SINK BACKFILLING: Check valve can effectively prevent kitchen sink backfilling and odor transmission to ensure one way flow of water DURABLE MATERIAL: Non return valve is made of thickened excellent PVC material, durable and rust resistant for long periods of use STRONG RESISTANCE: Check valve use an efficient prevent backflow design to stop the reverse flow and avoid leakage problems EASY INSTALLATION: The PVC inline check valve support simple installation steps and can be easily installed in the downpipe for quick and easy installation MULTI SCENARIO APPLICATION: One way check valve is suitable for kitchen, toilet or other sewer pipes to provide you with comprehensive protection against backfilling Specification: Item Type: Check Valve Material: PVC Package List:1 x Check Valve Body 1 x Valve Package List 1 x Check Valve Body 1 x Valve