Closed ball air chuck, FNPT dual head air chuck and closed flow. They have good corrosion resistance and wear resistance, long service life. 1/4 inch closed ball air chuck - with 1/4 inch female national pipe thread, it has the function of checking pressure and inflation. 1/4 inch FNPT dual head air chuck - with 1/4 inch fnpt air inlet, its function is to allow the shut-off valve to shut off air flow when the stem is not open. Closed ball air chuck: Max pressure: 300 psi Temperature rating: -40 - 200 degrees fahrenheit Weight: 0.95 ounces Connection size: 1/4 inch fnpt air inlet Function: Shut off air flow when the stem is not open. Used for: General commercial and industrial air filling applications. FNPT dual head air chuck: Max pressure: 150 psi Weight: 1.94 ounces Connection size: with 1/4 inch female national pipe thread Function: 2 in 1 - Check pressure and inflation. Used for: Tires on trucks, RVs, buses etc. Advantage: Inflate tires directly with a push-in chuck design; No need to thread the chuck onto the valve stems, just push the chuck onto the valve for a strong seal. color: yellow Material: metal size: Length: 20 cm Package contents: 1 x Closed ball air chuck 1 x NPT dual head air chuck Only the above package content, other products are not included. Note: Light shooting 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 +/- 1-3 cm.