This air coupler and plug kit base flow is 1/4inch, and the maximum operating pressure is 300PSI. The package includes 5pcs quick connectors. This 1/4inch NPT ATM connector is universal, with plug. This connector accepts A, T, type plugs and is the perfect solution for workshops that use a of plugs. This quick connect air fitting set is perfect general use. The anodized color coating is highly scratch resistant. If you have any questions, please get in touch with us, our service team will provide you with a professional and satisfactory service. Material: Aluminum alloy Color: Red Package Contents: 1x 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.