R1234YF Low Side AdapterBlue R1234YF Low Side Quick Coupler: Low side R1234yf coupler 14 mm female x 1/4"SAE male. R12 to R134a Adapter Connector: 1/4" SAE female x low pressure 13mm R134A quick coupler. R1234YF High Side AdapterRed R1234YF High Side Quick Coupler: High side R1234yf coupler 17 mm female x 1/4"SAE male. R12 to R134a Adapter Connector: 1/4" SAE female x High pressure 16mm R134A quick coupler. Premium QualityThe R134A to R1234YF quick couplers are made of brass mental material, pass a strict inspection to ensure high quality and premium performance, long lasting to use. Accurate knurled grip ring for easy operation. No LeakageThe combination of the ball lock design and rubber seal provides excellent sealing performance. R134a to R1234yf Conversion Kit with automatic closing function, easier and more convenient to disassemble and install. ApplicationThis R1234YF to R134A low and high side quick coupler fits for R1234YF/R12 to R134A car air-conditioning AC charging, R1234yf refrigerants, AC manifold gauge, diagnostic check, recovery and evacuation work.