Interstate Pneumatics VC440 In-Line Check Valve 1/4" FPT x 1/4" FPT Length: 64mm (2.5 inch) | Outer Diameter: 28mm (1.1 inch) Fluid Type: Clean Air | Pressure Range : 0-150 PSI Temperature Range: 20 F - 150 F | Maximum Pressure Rating: 225 PSI Lubrication: Not Required Material: Aluminium