Vixen Horns 1/4" OD Nylon Plastic Hose Up to 225PSI 20 Feet for Train/Air Horn Systems and Other Suspension Applications VXA7142 Length: 20 Feet Working Pressure: 225PSI Outer Diameter (OD): &frac14; inch Inner Diameter (ID): 1/8 inch Wall Thickness: 1/16 inch