Nozzles must be able to vaporize Fast Flash Fuel, meter the delivery of the fuel, and prevent manifold back-flash, without failure. All Nozzles contain a filter assembly rated at 25 microns, which prevents possible engine blow-by from clogging the nozzles and nylon tubing. The filter assembly helps prevents foreign contamination from installation. Product Features:Meters the delivery of the fuelPrevents manifold back flash without failureVaporizes fast flash fuel