This allows an additional nozzle to be mounted in any of our Boost Cooler^TM kits. It includes a Tee, or splitter, junction piece with our quick-connect fittings, a nozzle holder and a section of hose. Note - injector nozzle is not included. Mounting additional nozzles are required when you need a quantity greater than one nozzle can provide, or if you have a dual plenum/throttle body/carburetor setup to get even distribution.