There is an arrow sign on valve showing direction, please follow the sign to connect pipes. This is a normally close type electric solenoid valve, power on to open it and power off to close it. Body material body zinc alloy + copper coil. This solenoid valve is designed to installed indoors horizontally in a dry environment. If used outdoors, the coil part should be well protected from water. Suitable for use with pipelines in water, air, oil and low viscosity non-corrosive fluid applications., Weight: 1.322773572 Pounds, Manufacturer: Zerodis