Humphrey 1/2 pipe, piston-poppet solenoid valves achieve fully ported, high flow performance relative to overall size. Hard coated, cast aluminum body permits resistance to wear and easy mounting/plumbing. The pressure unbalanced design shifts reliably and seals tight over millions of trouble-free cycles. 3 and 4 port models offered. Non-standard voltages available - Contact factory. Made in USA.