Fill Cap with Lanyard Boss

Choose your size. Choose your color.





Image Part Number Description Price Unit
C73-715 C73-715
LANYARD CHAIN KIT STAINLESS STEEL A popular addition to the Pro-werks Fuel Cell Fill Cap Assemblies.

Fits 2 3/4" or 4 1/4" (lanyard boss type) Easy Turn Fill Caps.

1 5/8" & 2" size fill caps are not available with the built in lanyard boss feature.
See Product Details
$19.99 Each
C73-780-LB C73-780-LB
2-3/4 in. BLACK FILL CAP WITH LANYARD BOSS & O-RING 2-1/4-10 Straight Thread

Accepts Lanyard Chain Kit
Includes O-Ring

Made in the USA

(Cap Replacement O-Ring is C73-788-A)
See Product Details
$49.99 Each
C73-781-LB C73-781-LB
2-3/4 in. RED FILL CAP WITH LANYARD BOSS & O-RING 2-1/4-10 Straight Thread

Accepts Lanyard Chain Kit
Includes O-Ring

Made in the USA

(Cap Replacement O-Ring is C73-788-A)
See Product Details
$49.99 Each
C73-782-LB C73-782-LB
2-3/4 in. BLUE FILL CAP WITH LANYARD BOSS & O-RING 2-1/4-10 Straight Thread

Accepts Lanyard Chain Kit
Includes O-Ring

Made in the USA

(Cap Replacement O-Ring is C73-788-A)
See Product Details
$49.99 Each
C73-783-LB C73-783-LB
2-3/4 in. SILVER FILL CAP WITH LANYARD BOSS & O-RING 2-1/4-10 Straight Thread

Accepts Lanyard Chain Kit
Includes O-Ring

Made in the USA

(Cap Replacement O-Ring is C73-788-A)
See Product Details
$49.99 Each
C73-784-LB C73-784-LB
2-3/4 in. POLISHED FILL CAP WITH LANYARD BOSS & O-RING 2-1/4-10 Straight Thread

Accepts Lanyard Chain Kit
Includes O-Ring

Made in the USA

(Cap Replacement O-Ring is C73-788-A)
See Product Details
$49.99 Each
C74-780-LB C74-780-LB
4-1/4 in. BLACK FILL CAP WITH LANYARD BOSS & O-RING 3-3/4-8 Straight Thread

Accepts Lanyard Chain Kit
Includes O-Ring

Made in the USA

(Cap Replacement O-Ring is C74-788-A)
See Product Details
$65.99 Each
C74-781-LB C74-781-LB
4-1/4 in. RED FILL CAP WITH LANYARD BOSS & O-RING 3-3/4-8 Straight Thread

Accepts Lanyard Chain Kit
Includes O-Ring

Made in the USA

(Cap Replacement O-Ring is C74-788-A)
See Product Details
$65.99 Each
C74-782-LB C74-782-LB
4-1/4 in. BLUE FILL CAP WITH LANYARD BOSS & O-RING 3-3/4-8 Straight Thread

Accepts Lanyard Chain Kit
Includes O-Ring

Made in the USA

(Cap Replacement O-Ring is C74-788-A)
See Product Details
$65.99 Each
C74-783-LB C74-783-LB
4-1/4 in. SILVER FILL CAP WITH LANYARD BOSS & O-RING 3-3/4-8 Straight Thread

Accepts Lanyard Chain Kit
Includes O-Ring

Made in the USA

(Cap Replacement O-Ring is C74-788-A)
See Product Details
$65.99 Each
C74-784-LB C74-784-LB
4-1/4 in. POLISHED FILL CAP WITH LANYARD BOSS & O-RING 3-3/4-8 Straight Thread

Accepts Lanyard Chain Kit
Includes O-Ring

Made in the USA

(Cap Replacement O-Ring is C74-788-A)
See Product Details
$65.99 Each


Fill Cap with Lanyard Boss


If you would like to keep your Easy Turn Cap close by after you remove it from the tank, Pro-werks provides another great solution -. the combination of the Lanyard chain kit and the Lanyard boss version of the Easy Turn Fill Cap will get the job done. 

Simply attach the one end of the optional stainless steel ball chain to the threaded boss on the underside of the cap, and the other end to a flange fastener on the inside of the fuel cell.

Keep your cap close.

  


These lightweight, non-vented Pro-werks Fill Caps feature deep finger notches for a positive and comfortable grip, this design is another Pro-werks innovation, appreciated by everyone who uses them. The 6061-T6 American melt billet aluminum is CNC machined for accuracy, and is available in your choice of either brilliance anodized black, red, blue, or silver, as well as micro-polished aluminum - all of these finishes are impeccable.


Great caps. Great colors.



This design uses a radial squeeze action on a Buna O-ring for a secure seal. Precision machined quick-start coarse threads make using these caps a breeze.

The large selection of Pro-werks’ mounting bungs are crafted from steel, aluminum or stainless steel and available in both weld-in and bolt-on styles.

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.


Popular uses for Easy Turn Fill Caps include:

  • Custom-fabricated tanks
  • Fuel cells
  • Rear End housings
  • Valve covers
  • Overflow tanks
  • Ice boxes for intercoolers
  • Ballast tanks
  • Inspection viewing ports

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.

Customer Comments:


"I use your bolt on caps and bungs on my carbon fiber Cummins common rail valve covers. Love the quality. Thank you."
             Randy Davis, Owner of OldSkoolFab, Inc.



"I upgraded my fuel cell to an Easy Turn fill cap assembly. It wasn't long until all my friends did the same. Great product!"
             As shared with us at the
PRI Show


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