About this item [SAFETY& DURABLE] -- Brass material, pass a strict inspection to ensure high pressure resistance with solid construction and stable performance. [WIDE COMPATIBLITY] -- The high & low quick couplers adapters are suitable for R1234yf refrigerants, AC manifold gauge, diagnostic check, recovery and evacuation work. [EASY INSTALLATION] -- Brass construction for quick and easy to install, red for high pressure, blue for low pressure, include 2 pcs removable brass adapter [PREMIUM QUALITY] -- The heavy duty low loss refrigerant manual couplers are made of brass mental material, pass a strict inspection to ensure high quality and premium performance. Specifications: .