Billet Proof Designs

Oil Pressure Gauge Adaptor - Chrome - For 1936-1969 Harley Davidson Big Twin Case - 1/8" NPT Fitting - Made In The USA

Chrome Bayonet CAM Style Vented Gas Cap for 1936-1973 Harley Davidson Models - Replaces HD 61103-36

Billet Proof Designs Hydro Clutch - Hydraulic Clutch Conversion for 1971-1976 Harley-Davidson Sportster XL Ironhead - Made in USA

Billet Proof® Blind Top Hat Bung, 5/16”-18 Thread, Mild Steel - Made In The USA

Billet Proof® Brass Gas Cap w/ Aluminum Stepped Flanged Tophat Bung

Vented or Non-Vented Gas Cap with Steel Stepped Flanged "Tophat" Bung - Brass

Billet Proof® Sight Glass Style External Fuel Gauge with Aluminum 3/4” NPT Stepped Flanged Tophat Bung

Billet Proof® Sight Glass External Fuel Gauge with Bung - Nickel Plated Steel Gauge, 3/4” NPT Steel Stepped Flanged Tophat Bung

Billet Proof® Hose Style Fuel Gauge for Gas Tank with Stepped Flanged Steel "Tophat" Bungs, Clear Hose and Brass Fittings

Billet Proof® Hose Style External Fuel Gauge for Gas Tank - Yellow Tygon Fuel Hose w/ Flush Mount Steel Bung and Brass Hose Barbs

Vented or Non-Vented Gas Cap w/ Aluminum Stepped Flanged “Top hat” Style Bung - For Aluminum Tanks Only

Billet Proof® Vented or Non-Vented Gas Cap w/ Steel Stepped Flanged “Top hat” style Bung