materials and safety This adapter fits most cold charges for R1234YF and R134A. It uses a solid brass valve core and a rubber seal to prevent leakage and ensure safety. Efficient handling and conversion The R1234YFZUR134A adapter can convert from R134A to R1234YF, helping to improve working efficiency. It is compatible with a 3way R1234YF/R134AAC distributor tool and an AutoR134A charging hose. workmanship and durability Manufactured with precision and quality for a smooth appearance and a solid structure. It is designed to withstand heat, rust, erosion, and pressure without breaking. Easy installation and leak prevention Features rubber seals, proper thread depths, and precise threads to prevent leakage and improve the tight performance of your AC system. Easy to use, install, and remove. Use scenarios Auto service and maintenance on vehicles using R134A or upgrading to R1234YF, using a 3way distributor tool and an AutoR134A charging hose. Onsite refrigerant conversions during mobile AC servicing to match system requirements. Workshop or field repairs that require swapping between R134A and R1234YF during charging or discharge tasks.