The Allstar Performance Filler Cap Black with Weld-In Steel Bung Large (ALL36175) is a bung-and-cap fill plug kit with a weld-in steel bung and a black anodized aluminum threaded cap. The easy-grip cap uses an O-ring for a positive seal and is commonly used as an inspection plug or filler plug.
- Opening: 3 in
- Bung Material: Steel
- Bung Mounting: Weld-In
- Cap Material: Aluminum, threaded, O-ring seal
- Finish: Black Anodized
- Package: Bung and cap, kit
Spec Sheet: Allstar Performance Filler Cap and Bung Kit Spec Sheet (PDF)
FAQ
What does this filler cap and bung kit include?
This kit includes a weld-in steel bung and a matching black anodized aluminum threaded fill cap with an O-ring for a positive seal.
What size opening does this kit have?
This kit has a 3 in opening, sized for larger filler or inspection plug applications.
How is the bung installed?
The steel bung is designed to be welded onto the tank or panel.
What is the cap finish?
The aluminum threaded cap on this kit has a black anodized finish.
What is this kit commonly used for?
Bung and cap kits like this are commonly used as an inspection plug or filler plug on fuel cells, dry sump tanks, or fabricated panels.

