Image Part Number Description Price Unit
C73-730 C73-730
1-5/8 in. BLACK FILL CAP WITH STEEL WELD BUNG 1-1/4-12 Straight Thread
1-1/2 in. Outside Diameter Bung
1/2 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-749)
See Product Details »
$38.99 Each
C73-731 C73-731
1-5/8 in. RED FILL CAP WITH STEEL WELD BUNG 1-1/4-12 Straight Thread
1-1/2 in. Outside Diameter Bung
1/2 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-749)
See Product Details »
$38.99 Each
C73-732 C73-732
1-5/8 in. BLUE FILL CAP WITH STEEL WELD BUNG 1-1/4-12 Straight Thread
1-1/2 in. Outside Diameter Bung
1/2 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-749)
See Product Details »
$38.99 Each
C73-733 C73-733
1-5/8 in. SILVER FILL CAP WITH STEEL WELD BUNG 1-1/4-12 Straight Thread
1-1/2 in. Outside Diameter Bung
1/2 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-749)
See Product Details »
$38.99 Each
C73-734 C73-734
1-5/8 in. POLISHED FILL CAP WITH STEEL WELD BUNG 1-1/4-12 Straight Thread
1-1/2 in. Outside Diameter Bung
1/2 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-749)
See Product Details »
$38.99 Each
C73-750 C73-750
2 in. BLACK FILL CAP WITH STEEL WELD BUNG 1-1/2-12 Straight Thread
1-3/4 in. Outside Diameter Bung
1/2 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-769)
See Product Details »
$41.99 Each
C73-751 C73-751
2 in. RED FILL CAP WITH STEEL WELD BUNG 1-1/2-12 Straight Thread
1-3/4 in. Outside Diameter Bung
1/2 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-769)
See Product Details »
$41.99 Each
C73-752 C73-752
2 in. BLUE FILL CAP WITH STEEL WELD BUNG 1-1/2-12 Straight Thread
1-3/4 in. Outside Diameter Bung
1/2 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-769)
See Product Details »
$41.99 Each
C73-753 C73-753
2 in. SILVER FILL CAP WITH STEEL WELD BUNG 1-1/2-12 Straight Thread
1-3/4 in. Outside Diameter Bung
1/2 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-769)
See Product Details »
$41.99 Each
C73-754 C73-754
2 in. POLISHED FILL CAP WITH STEEL WELD BUNG 1-1/2-12 Straight Thread
1-3/4 in. Outside Diameter Bung
1/2 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-769)
See Product Details »
$41.99 Each
C73-770 C73-770
2-3/4 in. BLACK FILL CAP WITH STEEL WELD BUNG 2-1/4-10 Straight Thread
2-3/4 in. Outside Diameter Bung
5/8 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-788-A)
See Product Details »
$47.99 Each
C73-771 C73-771
2-3/4 in. RED FILL CAP WITH STEEL WELD BUNG 2-1/4-10 Straight Thread
2-3/4 in. Outside Diameter Bung
5/8 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-788-A)
See Product Details »
$47.99 Each
C73-772 C73-772
2-3/4 in. BLUE FILL CAP WITH STEEL WELD BUNG 2-1/4-10 Straight Thread
2-3/4 in. Outside Diameter Bung
5/8 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-788-A)
See Product Details »
$47.99 Each
C73-773 C73-773
2-3/4 in. SILVER FILL CAP WITH STEEL WELD BUNG 2-1/4-10 Straight Thread
2-3/4 in. Outside Diameter Bung
5/8 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-788-A)
See Product Details »
$47.99 Each
C73-774 C73-774
2-3/4 in. POLISHED FILL CAP WITH STEEL WELD BUNG 2-1/4-10 Straight Thread
2-3/4 in. Outside Diameter Bung
5/8 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C73-788-A)
See Product Details »
$47.99 Each
C74-770 C74-770
4-1/4 in. BLACK FILL CAP WITH STEEL WELD BUNG 3-3/4-8 Straight Thread
4-3/8 in. Outside Diameter Bung
7/8 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C74-788-A)
See Product Details »
$81.99 Each
C74-771 C74-771
4-1/4 in. RED FILL CAP WITH STEEL WELD BUNG 3-3/4-8 Straight Thread
4-3/8 in. Outside Diameter Bung
7/8 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C74-788-A)
See Product Details »
$81.99 Each
C74-772 C74-772
4-1/4 in. BLUE FILL CAP WITH STEEL WELD BUNG 3-3/4-8 Straight Thread
4-3/8 in. Outside Diameter Bung
7/8 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C74-788-A)
See Product Details »
$81.99 Each
C74-773 C74-773
4-1/4 in. SILVER FILL CAP WITH STEEL WELD BUNG 3-3/4-8 Straight Thread
4-3/8 in. Outside Diameter Bung
7/8 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C74-788-A)
See Product Details »
$81.99 Each
C74-774 C74-774
4-1/4 in. POLISHED FILL CAP WITH STEEL WELD BUNG 3-3/4-8 Straight Thread
4-3/8 in. Outside Diameter Bung
7/8 in. Bung Height

Made in the USA

(Cap Replacement O-Ring is C74-788-A)
See Product Details »
$81.99 Each


Cap Assembly with Steel Weld-In Bung


Your fabricator will appreciate the stepped shoulder at the base of the bung, it serves as a positioning locator. This design feature holds the bung in place while welding in a hole of a flat surface, or in the end of tubing when constructing a filler neck extension. This grouping of cap assemblies includes a weld-able steel bung. 


The step ahead.

The lightweight, non-vented cap features positive grip finger notches that are easy to get a hold of. Prime 6061-T6 billet aluminum is precision CNC machined into a lightweight, attractively designed cap; featuring quick-start coarse threads. Each is supplied standard with a Buna O-ring; positive sealing and "radially squeezed " to hold the cap secure.



Great caps. Great colors.


To compliment the color coordination of your project, the caps are finished off in Pro-Werks Brilliance anodized colors in your choice of black, red, blue, silver, or beautifully Micro-polished aluminum. 


The right size matters.



Easy Turn Fill Caps come in many sizes and are packaged as complete assemblies with your choice of one of the many versatile mounting options, or each component is also available separately.



Be sure to check out the entire line up - Billet aluminum Easy Turn Fill Caps are a Pro-werks specialty.   Watch the Video below to learn more !


Proudly made here in the USA.


Note: Welding should always be performed by a qualified welder.






Finish Your Tank

We also offer a full line of weld-in plumbing bungs to complete your tank project.

Click the images below to view all the options.


   

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