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Meziere weld-in cap and bung assemblies can be used in a variety of fabrication projects—such as when constructing fuel tanks or installing filler/inspection caps on differentials or valve covers. The sets feature machined 6061 aluminum caps with O-rings in several different styles and sizes—mated to machined bungs of 6061 aluminum, 4130 steel, or 303 stainless steel. Meziere weld-in cap and bung assemblies are available in styles to suit your many uses.
( 27 )
$24.23
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$40.56
Summit Racing™ billet fill plug kits enable you to put a fill plug where you need it. They include an aluminum or steel bung for use as an inspection plug or filler plug, plus an easy-grip cap with an O-ring for a positive seal.
( 3 )
$33.99
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$34.99
Allstar Performance fill plug kits enable you to put a fill plug where you need it. They include an aluminum or steel bung for use as an inspection plug or filler plug, plus an easy-grip cap with an O-ring for a positive seal. The kits are available with a small 1 3/8 in. opening or a large 3 in. diameter opening. These weld-on or bolt-on fill cap kits are available in a variety of styles and finishes.
( 18 )
$28.99
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$104.99
Rhodes Race Cars billet aluminum water tank caps are made specifically to support today's high horsepower turbo/supercharged vehicles with air-to-water intercooled systems. These billet tank caps are available in a variety of configurations and finishes, and come complete with hardware and O-ring for a watertight seal. No need to fight getting ice into your intercooler tank again! With a Rhodes billet aluminum water tank cap it's no longer a problem at all. Features, specs and parts included: * Billet aluminum construction * Natural or black anodized finish, with Rhodes Race Cars logo * Special thread-profile to help prevent cross threading * Ultra-lightweight flush mount design with O-ring seal * Includes necessary mounting hardware for bolt-on installation * Easy turn fill caps are available many sizes and mounting configurations to fit almost any application
( 2 )
$59.95
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$149.95
Moroso weld-on filler cap kits are universal to "fill" many needs. They can be used on power steering tanks, radiator overflow tanks, rear-ends, and valve covers—as well as other locations to replenish fluid or to serve as inspection ports. These kits include either a steel or aluminum weld-in bung with O-ring for leak-free sealing, and an aluminum cap with the Moroso logo (plain cap also available).
( 9 )
$39.99
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$45.99
On Sale
Holley weld-on fill cap kits include a cap CNC-machined from 6061-T6 billet aluminum with a bright, black anodized finish for great looks and corrosion protection. They're available with aluminum or steel weld bungs to match your application. Holley weld-on fill cap kit features include: * Allows for installation of a fill cap or inspection plug anywhere needed * Caps feature a laser-etched "Holley Equipped" logo * Easy-to-grip screw-on cap with O-ring seal and a 1.38 in. diameter opening * 1.950 in. O.D. / 1.400 in. I.D. weld bung * 1.810 in. diameter at the step of weld bung * 0.675 in. weld bung overall height * 0.570 in. height at the step of weld bung * 1 1/2-12 in. thread
( 2 )
$56.19
$30.90
Earl's Performance 6061-T6 billet aluminum fill caps are CNC-machined and anodized with a bright black anti-corrosion finish. They're shipped in a kit which also includes an O-ring seal and your choice of a steel or aluminum weld bung (some models may be available with bolt-on flanges). Most of Earl's easy-grip fill caps have a 1.380 in. diameter opening, and they're laser-etched with the brand name pros depend on!
( 3 )
$56.19
Holley bolt-on fill cap kits allow you to put a fill cap or inspection plug anywhere they're needed. These particular kits make a great alternative to a stock fuel cell cap—or if you need a fill cap for that custom oil tank or valve covers you're building. Holley bolt-on fill cap kit additional features include: * CNC-machined from 6061 T-6 billet aluminum * Bright black anodized finish for corrosion protection * 2.17 in. 4-bolt style flange * Cap features a laser-etched "Holley Equipped" logo * Bolt-on fill cap with an O-ring seal (has 1.38 in. diameter opening) * Easy-to-grip screw-on cap * Thread 1 1/2 in.-12 * Stainless steel hardware included
( 6 )
$88.25
Tanks Inc. weld-on filler cap kits are universal to "fill" many needs. They can be used on power steering tanks, radiator overflow tanks, rear-ends, and valve covers—as well as other locations to replenish fluid or to serve as inspection ports. These kits include either a steel or aluminum weld-in bung with O-ring for leak-free sealing, and an aluminum cap. Order the rear end filler and drain kit that is best suited to fit your application needs.
Not Yet Reviewed
$27.99
Vibrant Performance offers a comprehensive, diverse, and ever-expanding selection of high performance fluid delivery components that are race-proven to deliver outstanding quality and reliability with great value. Vibrant Performance weld-on fill cap kits consist of an aluminum tank weld bung and threaded cap. The caps are available polished or black anodized and the kits are available in several bung O.D. sizes. Vibrant weld bungs feature an improved flange design that resists warping during welding. Please note: DO NOT weld the bung with the threaded cap installed.
Not Yet Reviewed
$42.99
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$43.99
Peterson Fluid Systems offer all of their tank caps and filler necks as assemblies to use on your own and complete your projects. Steel caps are cadmium plated for corrosion resistance and come with an aluminum filler neck. The steel caps also feature a bayonet-style lock. The billet aluminum caps come in 1 7/16 in. and 3 in. sizes, and they are anodized for durability.
Not Yet Reviewed
$52.99
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$103.99
Rhodes Race Cars fill caps with a weld-in bung can be used in a wide variety of applications, from valve covers to rear-end housings. They are made from 6061 T-6 aluminum and are CNC-machined to exact tolerances. They feature an O-ring seal and coarse threads for ease of starting when installing the cap. They are available in a variety of sizes and anodized colors, along with aluminum or steel weld-in bungs.
Not Yet Reviewed
$29.95
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$32.95
Meziere offers replacement caps for their weld-in cap and bung assemblies. These threaded caps are machined from 6061 billet aluminum and include an O-ring for leak-free sealing. The outer edge is diamond-knurled for easy grip.
( 1 )
$17.33
With PRP billet machined extra-large filler caps there is no need to fight getting ice into your intercooler again! These one-of-kind extra-large caps offer almost a 7 in. opening and are sealed with a Buna-N O-ring for a watertight seal. All caps are completed with an anodized finish in either clear, red, blue, or black. Two available styles, a weld-on version or bolt-on version, come complete with stainless steel hardware. Select the intercooler filler cap model in the finish suited to fit your needs.
Not Yet Reviewed
$186.99
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