This automatic flush valve from Hydrotek offers proven reliability as well as quick and easy installation. Features include: solid brass construction; superior piston flushing mechanism; manual-mechanical override; self-cleaning fine mesh screen filtration; long battery service life with (4) AA alkaline batteries; no reset required after pressure loss; piston seals unaffected by chlorine, chloramines and ammonia; and operating pressures from 10 psi to 125 psi. An AC-powered version is available.Hydrotek.