The Nidel® Model 37HD1 hose connection backflow preventers are intended for irrigation purposes and designed to protect hose connections from backflow contamination in freezing and non-freezing conditions. Manual draining is required and provides easy, sure drainage during freezing weather. Uses include outside hose bibbs, wash racks, dairy barns and swimming pool areas.
Woodford® Nidel® Backflow Preventer, 3/4 in Nominal, Male Garden Hose Thread x Female Garden Hose Thread, 125 psi, 120 deg F, Dual Check Backflow, Polished Chrome, Domestic