TracTuff Radiator Cap Bung
TracTuff billet radiator cap bung is used with our 3" or 4" billet tank lids and matched perfectly for an inside weld but you can use it to fabricate anything that has a 1-1/2" hole or a 1-1/4" tube.
All billet parts are CNC machined from US milled 6061 aluminum. The domestic cap bung has a 1/8" NPT port and the import version has a 1/16" NPT for connection to an overflow. The domestic version uses any early model (late 70's Chevy C10 Pickup w/ 454) cap and the import version uses early model Honda (88'-91' Civic/ CRX and 90'-93' Integra) cap.