When modifying or replacing the air conditioning system. This air conditioner flush kit removes refrigerant oil, waste fluid and metal debris. The stainless steel bottle is less likely to shed metal debris than the aluminum cleaning bottle. | The Air Conditioner System Flush Kit is suitable for cleaning R134, R22, R12, R410 and R404 air conditioning systems and other systems，such as automotive air conditioning ducts, condensers, evaporators and home refrigerator and home air conditioning ducts. | The A/C flush kit comes with an adjustable automatic pressure relief valve and an easy-to-read pressure gauge to keep you safe in operation. When the pressure relief valve is tightened with the hex wrench in the kit, the pressure increases; when it is loosened, the pressure decreases. Note: Working pressure should not exceed 150 PSI. The flush appears as a mist between 40 PSI - 60 PSI, when the cleaning effect is best. | Fill the flushing bottle with light air conditioning flush (not included), then assemble the fitting to the canister and tighten it. The conical rubber tip can be sealed at the pipe opening. Connect the assembled flush bottle to the air compressor (not included) and open the valve and air pump for flushing and blowing of the air conditioning system. The accompanying instruction manual provides detailed operation. | 1*Empty Stainless Steel Flush Bottle，3 * Adapters (1 * Usa Interface And 1 * Japanese Interface And 1* European Interface)， Blow Gun Head With An Ac Flush Nozzle，3.28 ft Rubber Hose，Pressure Gauge That Reads Up To 200 Psi，O-Rings And Instruction Manual. If you accidentally lose your manual, contact AutoWanderer Tool for an electronic version! If you have any questions,plz feel free to contact us.