Commodity composition: This product contains 2pcs 1 or 4 bsp male safety valve, use for compressor, pressure switch. Product size: Product size: The red hat male safety valve diameter is 13mm, The red hat is eye-catching, so you can see the air valve at a glance. Commodity material: The pressure release valve is made of copper and plastic, The main body is made of copper, durable, stable and reliable. Easy to use: This air compressor is a safeguard to protect the compressor from back pressure. Wide range of applications: The tank pressure relief valve is mainly installed in small air compressor systems, gas storage tank, air receiver tank, and other related applications. Packing: 2pcs 1 or 4 bsp male safety valve Color: red, golden Material: copper and plastic Size: thread diameter 13mm Features: The tank pressure relief valve is mainly installed in small air compressor systems, gas storage tank, air receiver tank, and other related applications.