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Proform remote overflow billet aluminum radiator fill necks are designed to facilitate efficient coolant flow, help maintain optimal engine temperature and provides a secure and long-lasting connection point for coolant management. The radiator neck is specifically designed to be recessed into the tank, allowing the overflow tube to travel inside the tank and exit through a remotely mounted barb. This U.S.-patented design offers a slick solution for concealing the unsightly radiator overflow tube, giving your setup a sleek and clean appearance. The kit includes a billet aluminum filler neck, an unbent 18 in. tube, and a billet barb. For those building custom systems, a weld-on billet aluminum filler neck can be a valuable addition, allowing for a more secure and leak-free installation.
Not Yet Reviewed
$86.99
Summit Racing™ billet weld-on fill necks are ideal for use wherever a heavy-duty, custom application filler neck is required. They feature 6061 T-6 aluminum construction for durability in racing or street applications. These fill necks include 1/8 in. NPT to 3/8 in. barbed fittings for the plumbing of an expansion tank.
Not Yet Reviewed
$11.99
Canton Racing billet weld-on fill necks are ideal for use wherever a heavy-duty, custom application filler neck is required. They feature 6061-T6 billet aluminum construction for durability in racing or street applications. These fill necks include 1/8 in. NPT to 3/8 in. barbed fittings for the plumbing of an expansion tank.
( 7 )
$28.00
Vibrant Performance radiator filler necks feature 6061 aluminum construction. They weld-on, include hose barb fitting, and are offered in two sizes. Mate them with their matching caps (sold separately) for the proper sealing.
Not Yet Reviewed
$30.79
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$33.50
Find a place to fill from with these CSR inline radiator hose fillers. They provide a high positive fill point to help keep air out of your cooling system at all times. CSR's fillers are 6061-T6 billet aluminum machined and TIG-welded for durability.
( 8 )
$73.95
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$128.95
Made from cast aluminum for a smooth look, these Summit Racing™ radiator water filler necks are designed to go inline in the radiator hose. They include two 1 1/2 in. outlets and a 1/8 in. NPT overflow. They use a standard radiator cap and accept a 1 1/2 in. radiator hose.
( 22 )
$38.99
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$44.99
Some essential parts are just prone to wearing out due to what they're exposed to. Howe radiator filler necks help keep you from blowing a hole in your budget with an expensive radiator replacement. These universal billet aluminum necks are available in weld-on and weld-in versions to fit your specific application. Save your wallet and your radiator with a Howe radiator filler neck. Order the size designed to fit your specific model.
( 2 )
$13.99
DeWitts offers a wide range of engine cooling system components, including these universal radiator filler necks. Machined from billet aluminum with a standard size neck, they weld in easily to facilitate refilling your coolant reservoir.
Not Yet Reviewed
$39.99
Moroso radiator hose fillers are spliced into the upper radiator hose to provide more complete cooling system filling. They are available for a variety of inlet/outlet hose sizes. The inline aluminum fillers take a standard size radiator cap, and the cap receptacle is welded to a cast flange.
( 18 )
$44.99
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$65.99
Want to keep your high performance engine running prime? Moroso radiator filler necks are suitable for any competition or high performance street application. These radiator filler necks are offered in either billet aluminum or stamped aluminum to suit your needs, and are designed to accept a standard size radiator cap. (Not included)
Not Yet Reviewed
$32.99
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$51.99
Build your own expansion tank, modify a radiator, or solve a myriad of other cooling system problems with Meziere radiator cap receivers. These weld-on aluminum filler necks come fully machined with Meziere's unique pressure ramp, precision sealing surfaces, and are ready to install.
Not Yet Reviewed
$32.87
On Sale
Fluidyne remote billet radiator filler necks combine beauty and performance under your hood. Built from billet aluminum with a highly polished or chrome finish, the 5 in. long universal replacements come in three diameters: 1 1/4 in., 1 1/2 in., and 1 3/4 in. The filler necks feature a 1/4 in. male hose barb fitting and a high-quality Fluidyne cap to top it off (16 psi).
( 1 )
$69.00
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$99.00
$62.10
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$89.10
Made from cast aluminum for a smooth look, PRW radiator hose fillers are designed to fit inline in the radiator hose. They include two outlets and an NPT overflow. These fillers use a standard radiator cap. Order the model designed to fit your radiator hose diameter.
( 2 )
$35.82
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$58.32
BCI offers inline radiator hose fillers in several applications to provide a high positive fill point to help keep air out of your cooling system. BCI well-designed inline radiator hose fillers are made from quality aluminum for a smooth appearance and accept a standard radiator cap, which is included.
( 3 )
$79.99
The flange on Canton Racing's universal replacement filler necks accepts a standard radiator cap and fits Chevy intakes. They can also be used as replacement tops for Canton Racing water necks.
( 5 )
$40.00
JOES Racing Products radiator filler necks are high-quality filler necks machined from billet aluminum. JOES Racing Products radiator filler necks make the perfect choice for any fabricators building their own tanks or radiators.
Not Yet Reviewed
$25.95
On Sale
Fluidyne weld-on fill necks are ideal when you want a high performance piece for your radiator or surge tank. Available in a standard and mini size, they feature aluminum construction for durability in racing, street, or custom applications.
( 2 )
$23.00
$20.70
Mishimoto aluminum coolant fill necks are CNC-machined and ready to be welded for use with your custom project! Offered in two sizes, these high performance fill necks include a screw-in nipple for overflow and are compatible with their high-pressure radiator caps. Customize your fabricated aluminum radiator with Mishimoto aluminum coolant fill necks.
( 13 )
$22.95
AFCO Racing offers a wide range of replacement parts for nearly every facet of your vehicle—including billet aluminum weld-on radiator filler necks. These high-quality components will weld to any aluminum radiator. A 1/8 in. NPT removeable barb is included. Maintain your cooling system with factory-style parts from AFCO.
Not Yet Reviewed
$44.99
Howe inline filler necks are radiator accessories designed to help complete your race car's cooling system. These aluminum radiator hose filler necks complete your cooling system.
( 44 )
$35.99
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$40.99
Canton Racing offers a variety of radiator accessories—including these inline coolant filler tubes. CNC-machined from billet aluminum, they feature a mini fill neck and 1/4 in. NPT port for a coolant sensor. The filler tubes accept 1.5 in. hose.
Not Yet Reviewed
$119.00
Canton Racing extended fill necks raise the water fill point 6 in. above the manifold, which is ideal for bleeding off air within the cooling system. They feature Canton Racing's 6061-T6 billet aluminum construction for light weight and durability in racing environments. The fill tube is angled at 45 degrees to provide clearance for large air filters, scoops, etc. They include a 1/8 in. NPT to 3/8 in. barbed fitting for plumbing an expansion tank.
( 3 )
$82.00
Allstar Performance radiator hose restrictors stabilize water temperature and allow coolant to stay in the radiator longer for improved cooling. These aluminum funnel-shaped restrictors are easy to use. Just insert restrictors into lower radiator hoses and you should be good to go!
( 3 )
$19.99
DeWitts pivoting water necks are built from diecast aluminum. The O-ring sealed water necks rise at an angle and can be rotated for best possible radiator hose access. They include hardware necessary for installation.
( 2 )
$33.99
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$44.99
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