Fire Hydrant Backflow Preventer Length_75 Feet When making up the Cleveland

When making up the Cleveland lay for a cross lay or hose bed

National Stock Number (NSN 4210-01-521-1691)

firefighting or closed pressure applications such as use with nozzles

RMA Class A (high oil resistance)

A coupled length of hose should be tested to 1 1/2 times the working pressure and held for fifteen minutes without leaking or coupling movement

Fire Hydrant Backflow Preventer Length_75 Feet When making up the ClevelandDouble check valves back flow prevention assembly is used to protect water supplies from contamination or pollution due to back flow. Three top mounted test cocks ensure easy access during repair and maintenance. Consists of two spring loaded poppet type check valves and a mechanically independent, hydraulically dependent pressure differential relief valve. Designed to give maximum protection against back flow caused by back pressure or back siphonage