This billet fill cap kit lets builders add a fill cap or inspection plug anywhere it's needed. CNC machined from 6061-T6 billet aluminum with a bright black anodized finish and a laser-etched Holley Equipped logo, it uses an aluminum weld bung for permanent installation.
Specifications:
- Weld Bung Outside Diameter: 1.950"
- Weld Bung Inside Diameter: 1.400"
- Diameter at Step: 1.810"
- Overall Height: 0.675"
- Height at Step: 0.570"
- Thread: 1-1/2"-12
- Material: 6061-T6 Aluminum
- Finish: Black Anodized
- Part Number: 241-228
Features an easy-to-grip screw-on cap with an O-ring seal and a 1.38" diameter opening.
FAQ
How does this cap install?
It uses an aluminum weld bung for a permanent, welded-in installation.
What is the opening diameter?
1.38 inches, sealed with an easy-to-grip screw-on cap and O-ring.
What is it made of?
6061-T6 billet aluminum with a black anodized finish.

