The Mittler Bros. 1-1/4″ Aluminum Fill Cap is the replacement cap for the 1-1/4″ steel weld bung assembly (SKU 1000-301). The aluminum cap threads directly into the welded steel bung to seal the fill opening on rear-end housings, weight bars, and other fabricated components.
Pick this up when the original cap has been lost, stripped, or damaged — or keep a spare on the shelf so you’re never stuck without a fill cap when you need one. Sold individually. Made in the USA.
