The 1⅛″ FM Nozzle Inserts™ measure from 118-324 GPM.
Nozzle Inserts™ obtain flow-rates lower than what the 2.5″ 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® (HM2H).
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.
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