Rain Bird - Drainage Pop Up Relief Valve with 4 Inch PVC Elbow and Hub Fitting Adapter Category_Swing Pipe Tubing algae and other particles from

algae and other particles from blocking the pilot flow

yellowing and aging

Purple Non Potable Water Top

Replacement stainless steel filter elements are available in 200 mesh (75 micron)

Controller operates with one or two 9-volt alkaline batteries

Rain Bird - Drainage Pop Up Relief Valve with 4 Inch PVC Elbow and Hub Fitting Adapter Category_Swing Pipe Tubing algae and other particles fromA pop up water relief valve (also commonly known as a pop up drainage emitter) that is normally closed except when there is a build up of hydrostatic pressure. As the drainage pipes fill and build up slight pressure, the cover rises to allow the excess water to escape. Once the water is discharged the pressure drops and a stainless steel spring automatically retracts the cover to its closed flush position. The flush design of the product ensures that