SP Systems spray pistol (gun) with built in filter and brass spindle comes complete with hose clamp. If your sprayer gun is worn out or leaking, this is the replacement. Simply cut off your old damaged gun, put the hose clamp over the hose, push the gun into the hose, and tighten the clamp. Now attach your wand to the pistol and you are ready to do some more spraying. If you are getting any erratic spray coming out of the nozzle, be sure to check the filter screen for clogging. The SPKIT18F is used on many of the SP Systems backpacks including the SP0, SP1, SP2 and the EstateKeeper.