Fits three size: for bpv31 bullet piercing valve three in 1 entry for air conditioners HVAC, those bullet piercing valves match 1/4 inch, 5/16 inch and 3/8 inch tubing, update part No. AP4502525, BPV31D, GPV14, GPV31, GPV38, GPV56, MPV31 Quality material: fabricated from metal, durable and corrosion-resistant, It is a good alternative part, and won' t wear out or rust through the years Easy to use: use a hex key wrench to put in this part, requires totally 2 inch clearance for installation and operation Note: to wash the lines earlier than piercing in an effort to stop debris from moving into the refrigerant traces Colour:Silver Material:metal Package Contents: 6 * BPV-31 bullet piercing tap valve kits Only the above package content, assorted merchandise should not included. Note: Light taking pictures and varied reveals can cause the colour of the article within the picture slightly various from the genuine thing. The size allowed error is +/- 1-3cm.