This cleaning device connects directly to your shop air supply and when used with recommended liquid solvent will clean injectors more effectively than aerosol methods. It works on many domestic and imported vehicles with either high or low pressure systems. The gauges large dial face is easy to read through the complete range of 0-100 PSI (0-7 bar). The canister holds up to 18 fluid oz.; its brass and aluminum construction minimizes the possibility of failure. Comes with an under-hood hanger attachment and 72in. hose. Works with all OTC fuel injection system adapters. Decarbonize intake and combustion systems by using with the No. 7666 decarbonizing adapter and No. 7904 D-Karbonizer treatment. OTC No. 7000 Pro Inject-R Kleen fluid is used for injector cleaning.Includes: gauge- hose- instructions and Tools & Techniques manual.