1、Sturdy Structure: Having been through great workmanship, the check valve has sturdy structure that can bear and maintain stable high pressure. 2、Safer Connection: Designed to have male and female threads for connection, the DN40 check valve ensures secure sealing without any leakage. 3、Wide Application: Allows for extensive uses on fluid system, pneumatic system, variable frequency water pump, etc., preventing back flowing. 4、Premium Aluminum: Adopting premium aluminum alloy material, the spring loaded check valve is not likely to break and very durable for long use. 5、Quick to Install: Comes with a compact size and a light weight as well, the 5 way check valve is very convenient to install within minutes. 1 x Water Pump Check Valve Item Type: Water Pump Check ValveValve Body Material: Aluminum AlloyNominal Diameter: DN40Thread Inner Diameter: Approx. 44mm / 1.73inThread Outer Diameter: Approx. 46mm / 1.81inNominal Pressure PN: 16MPaConnection Form: Male thread, female thread. Drive Method: Hydraulic ControlType and Channel Position: straight through type. Structure Type: Spring loaded type.