【function】Refrigeration technology R22/R410a charging adapter for Sae 1/4" male to 1/4" Sae female air conditioning charger safety adapter. 【Precise control】The movable thimble can precisely control the high and low pressure valve needles of the air conditioning system. 【Easy to use】High-quality design, top-loading rotation is easy to use. No matter how the safety valve is placed, the way it works can be easily changed. 【Safe and reliable】High-quality CNC machine tools, multiple parts are connected together to prevent leakage. The equipment is sealed safely and reliably before handling.