Features: *1. 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 pressure 13mm R134A quick connector. *2. R1234YF High Side: red R1234YF high side quick connector, high side R1234YF connector 17mm female x 1/4 "SAE male. R12 to R134a adapter connector: 1/4" SAE female x high pressure 16mm R134A quick connector. *3. High-quality material: The quick connector is made of brass metal material, which is durable, strong, rust-proof, not easy to break, and can be used for a long time. *4. Easy to remove and install: R134A to R1234YF quick coupler has automatic closing function, which is easier to remove and install. The combination of ball lock design and rubber seal can provide excellent sealing performance. *5. Wide application: This low side and high side quick connector is suitable for AC charging of R1234YF/R12 to R134A on-board air conditioner, R1234yf refrigerant, AC manifold pressure gauge, diagnostic inspection, recovery and evacuation. Description: *1. Material: brass Package Includes: 2 x Quick Coupler Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.