Hayward ECX2712B1 - Pressure Gauge With DialThe Hayward ECX2712B1 Pressure Gauge is a necessary part to measure the water pressure in your filter system. This gauge will measure between 0 60 psi, but the average pressure should be maintained between 10 25 psi. Use this gauge to ensure that your filtration system is working properly. Compatible Filter Housings: DEP 500 Series Pleated Element D. E. Filter SwimClear Cartridge Filter Systems Perflex Extended Cycle D. E. Filter EC65, (W3)EC65A, EC75