Features DURABLE MATERIAL: Check valve uses medical grade material, safe and non toxic, acid, alkali, salt corrosion resistance STRONG AND STABLE: Non return check valve has high adsorption performance, thermal stability, chemical stability, high mechanical strength COMPACT AND PORTABLE: One way water check valve has small size, easy to carry and store, convenient to use, with good performance FUNCTION DESCRIPTION: 3/8in check valve is used in fluid systems to prevent fluid backflow, or used in pneumatic systems to prevent compressed air backflow, can be used in the temperature range from ‑20 degrees Celsius to 70 degrees Celsius WIDELY USED: Check valve can be used in water treatment, air purification, auto parts, machinery industry, household appliances, etc., effectively prevent media backflow Specification: Item Type: Check Valve Interface Diameter: Approx. 7 ~ 10mm / 0.28 ~ 0.39in Total Length: Approx. 43mm / 1.69in Opening Pressure: ≤2kpa Maximum Back Pressure: 200kpa Package List:2 x Check Valve Note:Pay special attention to the flow direction of the medium when installing the check valve; The normal flow direction of the medium should be consistent with the direction of the arrow indicated on the valve body, otherwise the normal flow of the medium will be cut off. Package List 2 x Check Valve