One way Valve Material: Made of solid 304 Stainless Steel spring, High pressure resistance, corrosion resistance,durable valve Valve Connection Pipe Size: Connection Threaded: 1/8 1/4 3/8 1/2 3/4 BSP Female Threaded; Thread size: 9.5mm 12.5mm 16.5mm 20mm 25mm; Length: 47mm, 48mm, 53mm, 58mm, 66mm; Working Pressure:0 3 MpaCheck Valve SaditYes: The surface of spring thread non return valve is precisely processed, with smooth edges, bright colors, not easy to fade, and beautSaditY.pisciculture. non return valve use for: Water treatment for swimming pool. Irrigation for agriculture.Valve Connector Joint Package includes: 1pcs × 304 Stainless Steel One way Check