The 1¾″ FM Nozzle Inserts measure from 282-771 GPM.
Nozzle Inserts obtain flow-rates lower than what the 2½″ orifice on the HM2H can accurately measure. They are required for flow-rates lower than 533 GPM.
FM Nozzle Inserts have achieved Factory Mutual approval for accurate flow rates when used with the 2½″ Hose Monster.
FM Nozzle Inserts have flow characteristics about equal to those of the 30″ long playpipe. The Nozzle Insert adds an extra layer of safety because with no soldered or brazed connections to wear out with age, it will never come apart during a flow test. Both sizes are Factory Mutual Approved for flow rate accuracy. Each one is about 3.5″ long and weighs only about a half-pound. You simply slide the nozzle insert into the inlet of the 2½″ Hose Monster. The hose threads in on top of it.
