[high quality] - the air conditioning system flushing kit is made of heavy-duty stainless steel and is durable. Integrated molding can prevent leakage and make it safer to use. In addition, this can be reused. The hose is made of rubber nylon resin, which is durable. The maximum working pressure is 500PSI, and the bursting pressure is up to 2500psi.[widely used and practical] - AC washing kit is designed for any light AC washing material and 1L large capacity bottle. It is well suited for R12, R134a, R404 and R22 a/c systems to remove contaminants, moisture and acids.[upgraded safety release valve] - the cleaning tool is equipped with a pressure reducing valve, which automatically releases when the pressure exceeds 170 psi, providing you with dual safety protection.[pressure gauge indicator] - a readable pressure gauge, which can monitor the air pressure in the bottle in real time. It is easy to operate, safe and reliable. Rubber tip nozzles help reduce spray during operation.[easy to use] - it is necessary to replace the failed air conditioning compressor to ensure that all debris is removed from the system. Therefore, it is very suitable for quickly and effectively removing old oil and debris before the compressor is replaced or the system is modified. Simply fill the tank, pressurize and flush each component for easy use.