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Thermostat Housing and Water Necks
Thermostat housing, water neck, water outlet, coolant housing…they’re all names for the same thing. This component is where the upper radiator hose plugs...
Thermostat housing, water neck, water outlet, coolant housing…they’re all names for the same thing. This component is where the upper radiator hose plugs in, and it also contains your mechanical thermostat. Grab a stock replacement to replace a leaky or broken one, dress up your engine with a chrome or anodized finish, or use a 360° swiveling model for versatility on your custom cooling system.
Top Brands
Our powerful search tools make it easy to find the right water neck from manufacturers like Meziere, Dorman, Mr. Gasket, Four Seasons, Trans-Dapt, ACDelco, and so many more.
Thermostat housing, water neck, water outlet, coolant housing…they’re all names for the same thing. This component is where the upper radiator hose plugs in, and it also contains your mechanical thermostat. Grab a stock replacement to replace a leaky or broken one, dress up your engine with a chrome or anodized finish, or use a 360° swiveling model for versatility on your custom cooling system.
Top Brands
Our powerful search tools make it easy to find the right water neck from manufacturers like Meziere, Dorman, Mr. Gasket, Four Seasons, Trans-Dapt, ACDelco, and so many more.
Showing In Stock Items. Show All 94 Items.
Summit Racing™ Aluminum Water Necks
Summit Racing™ aluminum water necks swivel 360 degrees to give you various radiator hose routing options. They come with bolts and a highly polished or anodized aluminum finish for a sharp appearance.
( 214 )
$25.99
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$42.99
Billet Specialties Thermostat Housings
Billet Specialties thermostat housings not only look good, but they also get rid of leaky paper gaskets thanks to their O-ring seal design. You can choose the conventional vertical housing or the high-tech 360 degree swivel housing. They're available straight-up or with a 0, 15, or 45 degree angle and come complete with stainless hardware.
( 245 )
$66.95
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$199.95
Chevrolet Performance Thermostat Housings
Chevrolet Performance offers the parts that you need to keep your cooling system running right.
( 161 )
$22.19
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$40.44
On Sale
Mr. Gasket Chrome Plated O-Ring Water Necks
Mr. Gasket chrome plated water necks feature an O-ring style seal to prevent water leaks. Precision die-cast for a great fit, they're first polished to a high luster, then beautifully chrome plated for lasting beauty. These water necks come complete with an O-ring and mounting bolts.
( 65 )
$23.51
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$29.84
$21.16
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$26.86
On Sale
Mr. Gasket Water Necks
Mr. Gasket offers replacement water necks in a variety of styles, materials, finishes, sizes, and angles. Water necks help to hold the vehicle's thermostat in place as it opens and closes—to regulate the flow of coolant through your engine. The opening in the water neck created by the thermostat allows coolant to flow from the radiator back to the engine. Order the model recommended for your vehicle.
( 119 )
$65.29
$23.14
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$76.05
Edelbrock Water Necks
Edelbrock water necks are a great way to finish off your engine. They feature an O-ring design base for an improved seal, which also allows for removal without requiring a new gasket. The necks fit any 1 1/2 in. diameter outlet hose, include mounting hardware, and are available in a variety of styles, materials, and finishes.
( 105 )
$19.95
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$49.95
ACDelco GM Genuine Parts Water Necks and Thermostat Housings
ACDelco water necks and thermostat housings fit your vehicle just like the originals. When you need to restore the efficiency of your water inlet/thermostat housing, these quality replacements fix your issues with leak-free performance and peace of mind. The units are available in a variety of configurations for applications from the 1960s and up. You can be assured that not only the fit, but also the function will be just as expected. Replace your water necks with one of the same from ACDelco.
( 32 )
$9.99
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$170.99
Allstar Performance Chevy Aluminum Water Necks
Allstar Performance Chevy aluminum water necks are designed to fit most Chevy V8 engines, will accept most standard thermostats, and swivel (up to a full 360 degrees, depending on the model) to simplify connection of left- or right-hand radiator hoses to the engine. Their black anodized finish helps protect against corrosion, along with stainless steel hardware and an O-ring for sealing the base to the engine. Get the performance you need and the looks you want with an assist from the Allstar Performance Chevy aluminum water neck best suited for your application.
( 52 )
$17.99
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$104.99
On Sale
Scott Drake Water Necks
Clean up your cooling system area with a Scott Drake water neck. These water necks are manufactured using quality materials, ensuring a proper fit.Paint it Ford engine blue to match original, leave natural or polish it to compliment any engine compartment.
( 86 )
$31.66
$23.29
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$93.89
Summit Racing™ Chrome Water Necks
Summit Racing™ water necks are made from cast steel with durable chrome plating, providing your engine bay with good looks and a long life. They include a paper gasket and bolts for a complete leak-free installation.
( 131 )
$15.99
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$38.99
Dorman Thermostat Housings
Replace your stock thermostat housing with new parts from Dorman. These quality replacement components offer solution upgrades for your coolant system, and they are available for several applications. Don't wait for your engine to overheat or for the check engine light to illuminate--upgrade to reliable, OE-fitting thermostat housings from Dorman.
( 182 )
$8.99
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$327.99
March Performance Thermostat Housings
March Performance thermostat housings are available in several styles and finishes covering a wide range of vehicle engine applications. Each housing is CNC-machined from 6061 T-6 aluminum and available polished, black anodized, or clearcoated. Most styles include mounting hardware and an O-ring for a clean seal. The 1.5 in. radiator hose neck swivels inside of base for perfect routing. March Performance thermostat housings are compatible with OEM and numerous aftermarket thermostats. Choose the one designed for your application.
( 11 )
$49.99
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$134.99
Moroso Manifold Filler Necks
Moroso offers manifold filler necks in a variety of styles, materials, and finishes—for applications from 1955 and up. These replacements locate the filler at the highest point to bleed off air on cars with low-mount radiators. The filler necks can be located on either the left or right side of the vehicle. They include 1/2 in. NPT fittings for the installation of a water temperature sending unit, and two 1/4 in. NPT fittings for return lines on popular aftermarket cylinder heads.
( 20 )
$47.99
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$160.99
Spectre Performance Water Necks
Spectre Performance water necks are available for a variety of applications. Many are designed around OEM specifications, are offered in different materials and finishes, neck angles, and swivel and non-swivel types. Spectre also offers water necks with bypass hose connections. Most will include bolts and O-ring where applicable.
( 34 )
$12.99
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$39.99
Summit Racing™ Water Necks
Made from investment cast aluminum for a smooth look, these Summit Racing™ water necks include two 1/4 in. NPT outlets, one 1/2 in. NPT outlet, and a 1/8 in. NPT overflow. They use a standard radiator cap, accept 1 1/2 in. radiator hose, and include gaskets and mounting hardware. They come in your choice of either a natural or black powdercoated finish.
( 22 )
$103.99
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$113.99
ACDelco Engine Coolant Thermostat Housings
ACDelco engine coolant thermostat housings are GM-recommended replacements for your vehicle's worn or damaged original equipment. The inline housing holds the thermostat and serves as a connection point for the radiator hose and inlet or outlet, and may also include ports for sensors or switches. These high-quality replacements are manufactured to fit your specific GM vehicle, providing the same performance, durability, and service life that you expect from General Motors.
( 5 )
$38.99
Granatelli Motor Sports Billet Thermostat Housings
Granatelli Motor Sports billet thermostat housings will upgrade your OE plastic housing to prolong the life of your motor. Factory units are known to crack, resulting in coolant loss. These replacement housings are made from 6061-T6 aluminum—and include a high-flow thermostat with copper, brass, and stainless steel construction for high reliability. No gaskets are required; the housings use factory bolts on the outside to maintain OE look and function, and they can be installed with basic hand tools. Order the model recommended for your engine application.
( 2 )
$140.42
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$274.31
Canton Racing Billet Aluminum Racer Water Necks with Filler Top
Canton Racing lightweight Racer water necks with filler tops are machined from billet aluminum. A compact modular design allows the body to be flipped so that the -16 AN outlet fitting can face left or right. These water necks feature a flange filler top, which accepts a standard radiator cap, top and bottom O-ring seals, a 1/2 in. NPT rear port for a temperature sender, and two 3/8 in. NPT ports for cooling lines. Hardware is included.
( 2 )
$139.00
CSR Thermostat Housings
CSR thermostat housings are constructed from CNC-machined billet 6061-T6 aluminum, with a variety of anodized color options. These water necks are available for 1 1/4 in., 1 1/2 in., or -16 AN fitting hose connections. The flange is sealed at the manifold with an O-ring, eliminating the gasket. Stainless steel hardware is included. Order the housing designed for fitment with your vehicle and engine application.
( 35 )
$66.95
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$155.95
PWR North America Billet Inline Thermostats
PWR North America billet inline thermostats are used throughout the industry to maintain peak horsepower coolant temperatures. They have AN bypass ports on the body to plumb a recirculation line for the warm-up cycle. Built to be rugged, these components offer the most flow available. PWR North America billet aluminum inline thermostats are offered in a range of applications. Order the billet inline thermostat designed for your application.
( 2 )
$309.00
CVR Thermostat Housings
Position your hose where you want it with CVR thermostat housings. These beautifully machined housings swivel 360 degrees for ease of installation. Crafted from T6-6061 billet aluminum, CVR thermostat housings are bright anodized in several finishes for a professional look under your hood. The flange is sealed at the manifold with an O-ring, eliminating the gasket, plus stainless steel hardware is included. You can count on high performance looks and operation with CVR thermostat housings.
( 67 )
$62.99
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$118.99
Summit Racing™ Billet Aluminum Water Necks
These Summit Racing™ 360 degree swivel water necks are constructed from high-quality T6-6061 billet aluminum and feature a beautiful, bright-anodized, machined finish. The flange is sealed at the manifold with an O-ring, eliminating the gasket, and stainless steel hardware is included.
( 28 )
$88.99
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$94.99
Mishimoto Thermostat Housings
A faulty thermostat can result in engine overheating and potential internal damage. Mishimoto thermostat with housings will keep temperatures under control. Featuring an upgraded aluminum housing and bleeder screw for enhanced durability, the thermostats are available in different styles to open at lower or stock temperatures, ensuring proper coolant flow. They are constructed using high-quality wax for reliable, repeatable operation. As with all their products, these thermostats with housings include the Mishimoto Lifetime Warranty, ensuring superior product quality and craftsmanship. Thermostat, housing, and gasket are included. Select the style needed for your vehicle.
( 1 )
$89.95
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$111.95
Meziere Water Necks
Meziere water necks are available in a wide range of styles, colors, finishes, and fitment options. These replacements offer factory-style performance and great looks under your hood. Matching outlets are sold separately.
( 19 )
$51.85
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$190.01
