Fits 3 size: for bpv31 piercing valve 3 in 1 access for air conditioners HVAC, these piercing valves fit 1/4 inch, 5/16 inch and 3/8 inch tubing, replace part No. AP4502525, BPV31D, GPV14, GPV31, GPV38, GPV56, MPV31Quality material: made of metal, sturdy and corrosion-resistant, It is a high quality replacement part, and won' t wear out or rust over timeEasy to use: use a hex key wrench to install this part, requires only 2 inch clearance for installation and operationNote: to clean the lines before piercing in order to prevent debris from getting into the refrigerant linesColour:SilverMaterial:metalPackage Contents:12 x BPV-31 piercing tap valve kitsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.