Suitable for three sizes: well suited for bpv31 perforated valve three in 1 device, appropriate for air conditioner HVAC, those perforated valves are right for 1/4 inch, 5/16 inch and 3/8 inch tubes, replacement part numbers. AP4502525, BPV31D, GPV14, GPV31, GPV38, GPV56, MPV31 Quality material: product of zinc alloy, strong, anti-corrosion, effective , durable, no rust Easy to use: Use a hexagon wrench to put in this part, solely five cm clearance is needed for installation and operation specification: Model: BPV-31 Port size: 0 cm, 1 cm, 0 cm Colour: black Material: metal Package Contents: four x perforated valves 4 x hex wrenches eight x adapters Note: Clean piercing to stop particles from getting into the fridge line Tips: Not well matched for refrigerant 410a. Only the above kit content, different item are not included. Note: Light and diverse displays may cause the color of the article within the photograph slightly diverse from the genuine thing. The dimension allowed error is +/- 1-3cm.