[ Piercing Tap Valve] BPV-31 piercing tap valve, replace part No.: AP4502525, BPV31D, GPV14, GPV31, GPV38, GPV56, MPV31; compatible with 1/4 inch, 5/16 inch, 3/8 inch outside diameter pipes. [Access Service Valve] The Hvac schrader valve with 1/4inch SAE x 1/4inch OD x 3.54inch stem, the core is a poppet valve assisted by a spring that is threaded into the steam. [Application] you only need a hex key wrench (included) to install this pierce valve; Its compact design only requires 2 inch clearance area for installation and use. These hvac service valves are generally used to have an easy access to the systems for vacuum, charging, pressure checkup and other applications. And the pierce and access service valve also can be used together for air conditioner refrigerant system. [Material] The piercing valve is made of - metal that ' t wear out or rust over time. The stem is a self-contained valve which opens to admit gas to a chamber. Material:Metal colour:Silver + Gold Package Contents: 1 x piercing valves 1 x hex keys 2 x adapters 5 x access service valves(Rod length 90mm) Only 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.