Description

Brass Vented Filler Cap & Bung Kit – 1.25"-12 Thread

Back by popular demand, we’re now offering a vented filler cap and bung kit featuring a solid brass cap. Built on the same trusted platform as our original design, this version combines classic styling with modern function—ideal for gas tanks, oil tanks, or any fluid reservoir requiring a vented setup.

The brass filler cap features a precision-drilled .040" vent hole with a replaceable internal brass vent fitting, helping reduce liquid seepage while allowing your tank to breathe. Its compact profile ensures a clean, low-key look, but the opening is still large enough to accommodate standard fuel nozzles.

The cap threads onto a 1.25"-12 weld-in bung, available in your choice of mild steel (standard), or upgrade to 6061-T6 aluminum or 304 stainless steel. A replaceable fuel-resistant O-ring ensures a secure, leak-free seal.

Product Features:

Cap Material: Solid 360 Brass – 1-5/8" O.D.
Vent Hole: .040" with internal brass vent fitting
Thread Size: 1.25"-12 – standard Bung King cap fitment
Bung Flange O.D.: 1.75", stepped down to 1.5" for easy weld-in
Seal: Replaceable fuel-resistant O-ring
Bung Material Options: Mild Steel (default), 6061-T6 Aluminum, or 304 Stainless Steel (add $3.00)
Applications: Gas tanks, oil tanks, or any vented fluid container
Made in the USA
Sold individually