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.

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.

Individual Parts

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Results 1 - 25 of 2000 +

Summit Racing™ Aluminum Water Necks SUM-371101

Water Neck, Cast Aluminum, Polished, O-Ring, 90-Degree, Chevy, Big/Small Block, Each

Part Number: SUM-371101

4.58 out of 5 stars ( 52 )

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Summit Racing™ Aluminum Water Necks SUM-371100

Water Neck, Cast Aluminum, Polished, O-Ring, 45-Degree, Chevy, Big/Small Block, Each

Part Number: SUM-371100

4.51 out of 5 stars ( 95 )

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Billet Specialties Thermostat Housings BLK90320

Water Neck, Billet Aluminum, Black Anodized, 75 Degree, Chevy, Big/Small Block, Each

Part Number: BSP-BLK90320

4.77 out of 5 stars ( 31 )

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Chevrolet Performance Thermostat Housings 10108470

Water Neck, Cast Aluminum, Natural, Chevy, Big/Small Block V8, Each

Part Number: NAL-10108470

4.81 out of 5 stars ( 129 )

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Summit Racing™ Aluminum Water Necks SUM-371100B

Water Neck, Cast Aluminum, Black Powdercoated, O-Ring, 45-Degree, Chevy, Big/Small Block, Each

Part Number: SUM-371100B

4.06 out of 5 stars ( 18 )

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Billet Specialties Thermostat Housings 90320

Billet Specialties Thermostat Housings 90320

Water Neck, Billet Aluminum, Polished, 15 Degree, Chevy, Big Block, Small Block, Each

Part Number: BSP-90320

4.94 out of 5 stars ( 34 )

Estimated Ship Date: Today

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Summit Racing™ Aluminum Water Necks SUM-370998

Water Neck, Thermostat Housing, Cast Aluminum, Polished, 60 Degree, Swivel, Chevrolet, LS, Each

Part Number: SUM-370998

3.89 out of 5 stars ( 9 )

Estimated Ship Date: Today

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Edelbrock Water Necks 4817

Water Neck, Aluminum, Polished, O-Ring, 45 degree, Swivel, Chevrolet, Each

Part Number: EDL-4817

4.35 out of 5 stars ( 48 )

Estimated Ship Date: Today

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Mr. Gasket Water Necks 2670BK

Water Neck, Aluminum, Black Anodized, Swivel, 60 Degree, Chevrolet, LS, Each

Part Number: MRG-2670BK

4.25 out of 5 stars ( 8 )

Estimated Ship Date: Today

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Mr. Gasket Chrome Plated O-Ring Water Necks 2661

Water Neck, Aluminum, Chrome Plated, O-Ring, 45 Degree, Chevy, Big/Small Block, Each

Part Number: MRG-2661

4.47 out of 5 stars ( 34 )

Estimated Ship Date: Today

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Billet Specialties Thermostat Housings 90820

Water Neck, Billet Aluminum, Polished, Straight Up, Chrysler, Dodge, Plymouth, Big Block, Small Block, Each

Part Number: BSP-90820

4.63 out of 5 stars ( 62 )

Estimated Ship Date: Today

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ACDelco GM Genuine Parts Water Necks and Thermostat Housings 12600172

Water Neck, O-ring Sealing Style, Aluminum, Natural, 186 degree Thermostat, Buick, Cadillac, Chevy, GMC, Each

Part Number: ADO-15-11057

4.44 out of 5 stars ( 18 )

Estimated Ship Date: Today

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Dorman Thermostat Housings 902-1001

Water Neck and Thermostat Housing, 60 Degree, Steel, Natural, Ford, Mercury, Each

Part Number: RNB-902-1001

3.89 out of 5 stars ( 36 )

Estimated Ship Date: Today

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Billet Specialties Thermostat Housings 90620

Water Neck, Billet Aluminum, Polished, 90 Degree, Ford, 260-302/351W, Each

Part Number: BSP-90620

3.77 out of 5 stars ( 22 )

Estimated Ship Date: Today

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Summit Racing™ Aluminum Water Necks SUM-371101-15

Water Neck, Cast Aluminum, Polished, O-Ring, 75 Degree, Chevy, Big/Small Block, Each

Part Number: SUM-371101-15

2.6 out of 5 stars ( 5 )

Estimated Ship Date: Today

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Summit Racing™ Aluminum Water Necks SUM-371101B

Water Neck, Cast Aluminum, Black Powdercoated, O-Ring, 90-Degree, Chevy, Big/Small Block, Each

Part Number: SUM-371101B

3.33 out of 5 stars ( 6 )

Estimated Ship Date: Today

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Scott Drake Water Necks C5OE-8592-A

Thermostat Housing, Aluminum, Natural, Gasket Seal, Ford, 289,.302, Each

Part Number: SDK-C5OE-8592-A

4.28 out of 5 stars ( 53 )

Estimated Ship Date: Today

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CSR Intake Manifold Water Filler Necks CSR 914C

Water Neck, Billet Aluminum, Clear Anodized, Swivel, 90 Degree, Chevy, Big/Small Block, Each

Part Number: CSI-914C

4.6 out of 5 stars ( 10 )

Estimated Ship Date: Today

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Billet Specialties Thermostat Housings 90420

Water Neck, Billet Aluminum, Polished, 45 Degree, Chevy, Big Block, Small Block, Each

Part Number: BSP-90420

4.94 out of 5 stars ( 18 )

Estimated Ship Date: Today

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Dorman Thermostat Housings 902-1003

Water Neck and Thermostat Housing, 90 Degree, Steel, Natural, Ford, Mercury, Each

Part Number: RNB-902-1003

3.47 out of 5 stars ( 19 )

Estimated Ship Date: Today

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ACDelco GM Genuine Parts Water Necks and Thermostat Housings for 2014-2018 SIERRA 1500, SILVERADO 1500 - 12674639

Water Neck and Thermostat Housing, Stock, Plastic, Black, Cadillac, Chevrolet, GMC, Each

Part Number: ADO-15-11125

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Summit Racing™ Chrome Water Necks SUM-G3801-3

Water Neck, O-Ring, Steel, Chrome, 15 Degree, Chevy, Big/Small Block, Each

Part Number: SUM-G3801-3

4.22 out of 5 stars ( 9 )

Estimated Ship Date: Today

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Allstar Performance Chevy Aluminum Water Necks ALL30173

Water Neck, Aluminum, Polished, O-Ring, 15 Degree, Chevy, Big/Small Block/V6, Each

Part Number: AAF-ALL30173

4.74 out of 5 stars ( 39 )

Estimated Ship Date: Today

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Billet Specialties Thermostat Housings BLK90220

Water Neck, Billet Aluminum, Black Anodized, 90 Degree, Chevy, Big/Small Block, Each

Part Number: BSP-BLK90220

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

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Mr. Gasket Water Necks 9713

Water Neck, Steel, Chrome Plated, 90 Degree, Ford, Small Block Windsor, Each

Part Number: MRG-9713

2.42 out of 5 stars ( 26 )

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