[PREMIUM MATERIAL]Made of high quality metal with great rust-resistant and anti-leaking performance. The hose is made of rubber,good pressure resistance, safe to use.both of the kit are made of corrosion-resistant metal that 't wear out or rust over time, and anti-leaking design that be . [ PIERCING VALVE KITS]BPV-31 Refrigerator Tap Valve Compatible with 1/4 Inch, 5/16 Inch, 3/8 Inch Outside Diameter Pipes, Replace for AP4502525, BPV31D, GPV14, GPV31, GPV38, GPV56, MPV31,A practical kit and convenient to use,Each kit including 1 piercing valve, 1 hex key, 2 adapters. [RH R134a Self-Sealing Adapter]Through the r134a self-sealing adapter, the r134a can tap off the refrigerator charging hose can compatible with r134a self-sealing cans. Male to connect the r134a can tap, the female to connect self-sealing cans. [REFRIGERATOR FREON RECHARGE HOSE WITH GUAGE]One side of the refrigerant charging hose is piercing r134a can tap to directly connect puncture refrigerant cans, the other side is