The Radium breather filter features the signature Radium green color and a black rubber top and 1/4" ID inlet. Vehicle Fitment: Universal Application Specifications: Inner Diameter: 0.75in Outer Diameter Bottom: 2.17in Outer Diameter Top: 2.0in Total Height: 2.38in Inlet Type: Straight Filter Base: Rubber Style: Cylinder Includes: (1) Filter with Hose Clamp