Superior material and durability - Made from solid, durable material that is wear resistant and reusable. It has high strength and can withstand high pressure and temperatures. Broad compatibility and purpose - Enables switching from R134A to R1234YF and saving. Compatible with the 3-way distribution unit R1234YF/R134A and the R134A charging hose. Excellent craftsmanship - Precision made with a smooth finish that reflects quality. Resists heat, rust, corrosion, and high pressure; designed not to crack under demanding conditions. Easy to install and seal - Includes rubber gaskets and deep, precise threads to prevent leaks and improve sealing. Easy to install and remove, and fits securely on your car AC system. Use scenarios - Retrofit or service: connects an R134A charging hose to an R1234YF system during refrigerant retrofit or cross-type service. - Workshop convenience: supports quick switching between refrigerants in a busy shop workflow. - On-site maintenance: suitable for vehicles using either refrigerant, reducing tool clutter and handling time.