Fire Hydrant Backflow Preventer With Relief Valve Hose Size (ID)_1 3/4" Hoses Two types of threads are

Two types of threads are used

National Stock Number (NSN 4210-01-080-1457)

in general

2 1/2 inch NH / NST threaded fittings actually measure about 3 inches across

Ships LTL freight on a pallet

Fire Hydrant Backflow Preventer With Relief Valve Hose Size (ID)_1 3/4" Hoses Two types of threads areReduced pressure zone valve assembly is ideal for use where Lead Free* valves are required. Designed for installation on potable water lines to protect against both backsiphonage and backpressure of contaminated water into the potable water supply. Assembly shall provide protection where a potential health hazard exists. Standards Compliance ASSE Listed 1013 IAPMO Listed CSA Certified B64. 4 AWWA compliant C511 Approved by the Foundation for Cross