Usage Tips:2Pcs Quick Connector Adapters R1234YF to R134A High Quick Couplers Connectors Features: [Wide Application] This low and high-side quick coupler is suitable for R1234YF/R12 to R134A car air conditioner AC charging, R1234yf refrigerant, AC manifold pressure gauge, diagnostic check, recovery, and evacuation work. [R1234YF High Side] R1234YF high side quick connector in red: High voltage side R1234YF connector 17mm female x 1/4" SAE male. R12 to R134a adapter connector: 1/4" SAE female x high voltage 16mm R134A quick connector. This R1234YF quick coupler fits R1234YF/R12 to R134A car air-conditioning AC charging. High-quality R1234YF to R134A hose adapter with strong construction to ensure high working performance, and long-lasting use. Ball lock design and rubber sealing ring can ensure good sealing for R1234YF to R134A conversion. [Easy to Remove and Install] The R134A to R1234YF quick coupler has an auto-off function, making it easier to remove and install. The ball lock design combined with the rubber seal provides excellent sealing performance. [High-qualty Material] The quick coupler is made of brass metal material, which is strong and durable, with high strength, rust resistant, not easy to break, and can be used for a long time. [R1234YF Low Side] Blue is R1234YF low side quick connector, low side R1234YF connector is 14mm female x 1/4" SAE male. R12 to R134a adapter connector: 1/4" SAE female x low voltage 13mm R134A quick connector. Specification: Product Name: Quick Couplers Material: Brass Size: 7.3 x 1.6cm/ 2.8 x 0.6 inch Color: Red + Blue Package Included: 2 X connector Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please allow slight dimension difference due to different manual measurements. Thank you for your understanding.