Highlight [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 13mm R134A quick connector. [R1234YF High Side] R1234YF high side quick connector in red: High side R1234YF connector 17mm female x 1/4" SAE male. R12 to R134a adapter connector: 1/4" SAE female x 16mm R134A quick connector. [High-Quality Material] The quick coupler is made of brass material, strong and durable, with high strength, rust resistant, not easy to break, and can be used for a long time. [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. [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. Product Name: Quick Couplers Key Features: 1. This R1234YF quick coupler fits R1234YF/R12 to R134A car air-conditioning AC charging. 2. High-quality R1234YF to R134A hose adapter with strong construction to ensure high working performance, and long-lasting use. 3. Ball lock design and rubber sealing ring can ensure good sealing for R1234YF to R134A conversion. Specification: Material: Brass Size: 7.3 x 1.6cm / 2.8 x 0.6 inch Color: Red + Blue