Flow restrictors cap the maximum flow rate through a Dosatron dosing system, keeping the injector inside its rated operating range. They are simple inline components that install in the supply plumbing ahead of the unit.Fit a restrictor when available water flow could exceed the doser's maximum. Over-speed operation causes noisy running, premature piston and seal wear, and dosing that drifts off ratio. Three ratings cover the common 3/4 in and 2 in system flows.Available Options 10 GPM 3/4 in [FR34-10GPM] 14 GPM 3/4 in [FR34-14GPM] 40 GPM 2 in [FR200-40GPM] Key Features Caps flow to keep a Dosatron within its rated range Protects the injector from over-speed wear Ratings for 10 GPM, 14 GPM, and 40 GPM systems Simple inline installation in the supply line No moving parts and no seals to service Choosing Your ModelMatch the restrictor to the maximum rated flow of your injector, not to your pump. A 3/4 in D14 rated to 14 GPM takes the 14 GPM restrictor; a 3/4 in system limited to 10 GPM takes the 10 GPM part. The 40 GPM restrictor is a 2 in body sized for D40 HiFlo installations.Ideal Applications Protecting 3/4 in and 1-1/2 in Dosatron dosers Stabilizing high-flow supply lines Greenhouse and irrigation plumbing Nutrient delivery system builds