Specifications: Material: Brass Alloy+Plastic+Zinc Alloy Working Pressure: 1.6MPa~3.2MPa. Temperature: 15-80 Centigrade Universal Retrofit Valve: Max. Internal Thread Type: 1/4" SAE Female Thread Min. Internal Thread Type: 8v1 Female Thread Outer Thread: Low Pressure 13mm R134A Quick Coupler BPV-31 Bullet Piercing Tap Valve: Replace part number: AP4502525, BPV31D, GPV14, GPV31, GPV38, GPV56, MPV31. Compatible with 1/4 inch, 5/16 inch, 3/8 inch outside diameter pipes. Package Included: 1 Pc x Universal Retrofit Valve with Dust Cap 1 Pack x BPV-31 bullet Piercing Tap Valve Kit .