Highlight the [R1234YF Low Side] Blue is the R1234YF quick coupler on the bottom side, the R1234YF connector on the low side is 14 mm female x 1/4" male SAE. Adapter connector R12 to R134a: 1/4" SAE female x low voltage connector R134A 13 mm. [R1234YF High Voltage Side] R1234YF High Voltage Side Quick Coupler in Red: R1234YF High Voltage Side Connector 17 mm Female x 1/4" Male SAE. Adapter connector R12 to R134a: 1/4" SAE female x high voltage connector R134A 16 mm. [High Quality Material] The quick coupler is made of brass, which is strong and durable, high strength, rust resistant, not easy to break and can be used for a long time. The ball lock design combined with the rubber seal ensures a perfect seal. [Wide Application] This low and high side quick coupler is suitable for charging AC car air conditioner R1234YF/R12 to R134A, refrigerant R1234yf, manifold pressure gauge AC, diagnostic inspection, recovery and evacuation. Key features: 1 . This R1234YF quick coupler fits AC charging car air conditioning R1234YF/R12 to R134A. 2. High quality hose adapter R1234YF to R134A with strong design for high working efficiency and long-term use. 3 . Ball lock design and rubber sealing ring can ensure good sealing when converting R1234YF to R134A. - Inner mesh panties Material: Brass Size: 7.3x1.6 cm/2.8x0.6 inch Kolor: red blue List of packages: 2 pcs. /set R1234YF to R134A