Sensible Combination to Use: you will receive 2 pieces of items in the high low side pressure R134A to R1234YF adapters kit in different colors, including 1 piece of red high pressure R1234YF quick coupler, and 1 piece of blue low pressure R1234YF quickcoupler, very useful in your daily life, and bring you lots of convenienceFunctional and Practical: the high low pressure R1234YF quick couples can not only be directly applied with R134A quick couplers for converting R134A to R1234YF, but also nicefor 3 way R1234YF or manifold gauge setExtensive Usages to Apply: the low side pressure R1234YF quick coupler is suitable for refrigerator recharge hose (converting refrigerator R134A charging hose to auto R1234YF charging hose), and automotive R134Arefrigerant charge hose (converting auto R134A charging hose to auto R1234YF charging hose); You can also use it for oil injector, simple and usefulReliable Material for Confident Using: made of strong brass, the high low side pressure R1234YF toR134A couplers is stable in structure and exquisite in workmanship, not easy to rust, deform, or break during the long serve life, and can make the R1234YF quick couplers stronger and more durableKnow More About size: the blue low pressure R1234YFquick coupler measures approx. 73 x 22 mm/ 2.87 x 0.87 inches, and the red high pressure R1234YF quick coupler is approx. 74.4 x 28 mm/ 2.93 x 1.1 inches, small and compact, easy for you to hold and grasp, convenient to store without occupying toomuch space