Feature●Radiator Pressure Cap●Fits Various Velvac Models●Pressure Rating: 4lb Installation Type: Threaded●Depth: 1.125" Diameter: 2.812" Plunger Diameter: 2.000"●Replaces: 10281, 31307Description Belgrade Parts & Service, Inc. CR Velvac 4LB. Radiator Pressure Cap Replaces: 10281, 31307