Iron 2 1/2" NH / NST Fire Hydrant Cap Threads_NH x NPT or a pollutant hazard exists

or a pollutant hazard exists (i

Compatible part number - DFP25F25S

The rubber lining is a single-ply extruded tube of synthetic EPDM compounded to resist ozone

NH or NST: National hose or national standard thread is often referred to as fire hose thread as this is by far the most common thread in use today by fire departments

It's usually installed on the inlet side (Suction Side) of a water pump to keep it from losing it's prime during the off cycle

Iron 2 1/2" NH / NST Fire Hydrant Cap Threads_NH x NPT or a pollutant hazard existsHeavy duty 2 1 2 inch replacement iron fire hydrant cap with NH NST threads including chain. Pentagonal in shape. The most common size and threads for US fire hydrants is 2 1 2 inch NH NST.