[COMPATIBLE WITH R1234YF AND 1/4" PORTS]: This high and low pressure coupler set is perfectly compatible with R1234YF service ports. The included adapters also ensure compatibility with 1/4" male flare fittings. They will allow you to quickly and easily service R1234YF air conditioning systems on cars, trucks, SUVs and other vehicles, both domestic and foreign. [NO LEAKAGE]: The internal and external threads are precisely designed for a perfect fit and easy replacement. The interface is also equipped with high-quality thick rubber O-rings for a tight seal. Perfect fit and superior protection against refrigerant leaks. [EASY TO USE]: These R1234YF adapter fittings are easy and convenient to install, adjust, and remove. [DURABLE]: Their aluminum and bronze construction ensures high resistance to abrasion and chemical corrosion. Ideal for connecting simple or advanced manifold gauges and for use on automotive air systems. Air conditioner refrigerant charging work.