Berryman offers two different through-rail injector cleaners—an aerosol and a pour-in style product.  Both products are called B-12 Chemtool Through-Rail Injector Cleaner and contain the same chemical.  The aerosol is part #1120 and is supplied with a 7/16-20 right-hand threaded tap.  The pourable product is part #1126 designed to be added to a special canister and pressurized with shop air.  There is no need to mix 1126 with gasoline.   In either case, the fuel pump should be disabled and the fuel line(s) disconnected, and the can or canister should be securely connected to the fuel rail.  The fuel line may need to be clamped to prevent spillage.  Once all fittings are secure and there is no leakage, start the vehicle and allow all the cleaner to be applied.  Once the can is empty and the engine stalls, reconnect the original fuel line(s) and enable the fuel pump.