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[R134a Low Side Coupler] The Boltigen refrigerator charging hose not only fits for fridge refrigerant system (called as refrigerator freon recharge hose), but also for auto ac refrigerant system by Matching with the r134a low side coupler, (called as car ac recharge kit> [R134a Self-Sealing Adapter] The Boltigen r134a refrigerant recharge hose can directly connect puncture r134a refrigerant cans, and also connect self-sealing r134a refrigerant cans by Matching with r134a self-sealing adapter [Refrigerator Freon Refilling Hose with Guage] The one side of piercing r134a can tap can directly connect puncture refrigerant cans, other side of 1/4 SAE female prot to connect refrigerator male port. And the gauge with colored dials with fahrenheit has scale readirgs for R134/R12/R22 [BPV-31 Bullet Piercing Tap Valve] This bpv31 piercing valve can be used for 1/4inch, 5/16irch, 3/8inch outside diameter pipes. Besides, this Bullet piercing tap