Proflow Replacement Steel Weld On Base For 460-32 - PFE477-32SPart Number: PFE477 32S Proflow's weld on bung and cap assemblies include non vented anodised caps that are lightweight, O ring sealed, and easy to grip. The female or male threaded bungs are bare 6061 T6 aluminium, so you can weld them to your fuel, oil, or water tank. These assemblies are available for fitment in multiple sized openings.