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 designed for long-term use. [Easy to Remove and Install] The R134A to R1234YF quick coupler features an auto-off function for easy removal and installation. The ball lock design combined with a rubber seal provides reliable sealing performance. [Wide Application] This low and high side quick coupler is suitable for R1234YF/R12 to R134A automotive air conditioning charging, R1234yf refrigerant systems, AC manifold pressure gauges, diagnostic checks, recovery, and evacuation procedures. Detailed About Us We supply professional quality air conditioning service tools and equipment. Our goal is to drive product innovation and technology to support automotive technicians. Product Name: Quick Couplers Key Features: 1. This R1234YF quick coupler is compatible with R1234YF/R12 to R134A automotive air conditioning charging systems. 2. High-quality R1234YF to R134A hose adapter with durable construction for reliable performance and extended service life. 3. Ball lock design and rubber sealing ring ensure effective sealing during R1234YF to R134A conversion. Specification: Material: Brass Size: 7.3 x 1.6cm / 2.8 x 0.6 inch Color: Red + Blue