This air coupler and plug kit base flow is 1/4inch, and the maximum operating pressure is 300PSI. The package includes quick connectors. This 1/4inch NPT ATM connector is universal, with plug. This connector accepts A, T, type plugs and is the solution for workshops that use a variety of plugs. This quick connect air fitting set is general use. The anodized color coating is highly scratch . If you have any questions, please get in touch with us, our service team provide you with a professional and satisfactory service. Material: Aluminum alloy Color: Red Package Contents: 2x air hose fittings set Only the above package content, other products are not included. Note: Light reflection 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.