Feature Reliable Material for Confident Using: made of strong brass and aluminium, is stable in structure and exquisite in workmanship, not easy to rust, deform, or break during the long serve life, and can make them stronger and more durable Functional and Practical: the high low pressure R1234YF quick couples can not only be directly applied with R134A quick couplers for converting R134A to R1234YF, but also nice for 3 way R1234YF or manifold gauge set Extensive Usages to Apply: the low side pressure R1234YF quick coupler is suitable for refrigerator Freon recharge hose (converting refrigerator R134A charging hose to auto R1234YF charging hose), and automotive R134A refrigerant charge hose (converting auto R134A charging hose to auto R1234YF charging hose);You can also use it for oil injector, simple and useful Pakage include2pcs adapters kit/ 6pcs adapters kitOptional