Standard 2" Backflow Preventer Male Threads_NPSH They are usually labeled FDC

They are usually labeled FDC (Fire Department Connection) and/or AUTO SPKR (Automatic Sprinkler)

Approx hole size 1" x 1/4"

The outside diameter of a 1

years of trouble free use and adequate reinforcement

This hose is constructed of an EPDM synthetic rubber tube and a double layer of 100% polyester woven jackets

Standard 2" Backflow Preventer Male Threads_NPSH They are usually labeled FDCDesigned to give maximum protection against backflow caused by back pressure or back siphonage from a cross connection wherein a contaminant hazard exists (i. e. a health hazard), or a pollutant hazard exists (i. e. a non hazard). Consists of two spring loaded poppet type valves and a mechanically independent, hydraulically dependent pressure differential relief valve. Three top mounted test cocks ensure easy access during repair and maintenance when