Philmac Air Release Valves Model:PHILMAC 1" (25MM) POLY AIR RELEASE VALVE The impeller is a SEMI

The impeller is a SEMI OPEN impeller for 12 mm free passage suitable for pumping groundwater

FEATURES:

Available in full- and part-circle models with optional stainless steel riser

High UV resistant

Flexible and easy to install in existing gardens

Philmac Air Release Valves Model:PHILMAC 1" (25MM) POLY AIR RELEASE VALVE The impeller is a SEMIPhilmac 1" Poly Air Release Valve to release air from a pipe. When the pressure inside the pipe drops and water is no longer being pumped through the pipe the plunger inside the valve will drop and allow air into the pipe. This can be useful to stop pipes from collapsing where water is draining out of a sprinkler at a low point in the system and no other provision is made to allow air into the system. On start up the system needs to expel air from the