Features: This check valves ensures fluid flows in single direction only, effectively preventing backflow. Make of durability Polyoxymethylenes materials, it solves leakage issues in homes water systems and industrial pipelines. The Polyoxymethylenes construction offer excellent chemical resistance, maintaining stability in harsh environments. Ideal for chemical plant and labs where long terms durability is essential. Designed for quick setup without tool, simplifying pipe connection. Perfect for temporary setups or mobile equipment requiring frequent adjustments. Fits various pipe diameters and types without extra adapters. Suitable for homes plumbing, irrigation systems, and small commercial facilities. Prevents fluid waste by controlling flows direction, supporting energy saving goals for both households and businesses. Specifications: Color:Six Choices Sizes: 5.9cm/2.32in 4.3cm/1.69in 5.2cm/2.05in Component:Polyoxymethylenes Package Includes: 1pc Singles-way valves check valves 2pcs connecting pipe 2pcs Sealing gasket 4pcs stainless steel screw×4 1pc Chinese and English bilingual installation guide note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.