This is the OS Max Joint Tube (Coupler Tube) for Securing a Tuned Pipe to a Header (manifold) on .21 size engines. FEATURES: Made of a black silicone material Secures tuned pipe to the header (manifold) INCLUDES: One Coupler Two Metal Clamps SPECS: Outside Diameter: 7/8" (22.2mm) Inside Diameter: 9/16" (14.3mm) Length: 1-9/16" (39.6mm)OS EnginesPart OSM72106300