BACOENG 5/16" Female SAE to 1/4" Male SAE Adapter for Mini Split System 5/16" Female to 1/4" Male SAE Swivel Adapter perfectly fits for R410a Mini Split System Air Conditioners,HVAC,and Refrigeration Service. This connector has a thimble,in the course of the operation,it will not open the air conditioning core tube,completely solve the problem of fluoride fluoride leakage injury,security is guaranteed. All of the access valves at the factory using the highest level of 100% brass,access valves high tensile strength while resisting corrosion. The package comes with 2x R-410a Straight Adapter for Mini Split System Air Conditioners (5/16" to 1/4") and instructions is not included.