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Thermostat Housing and Water Necks

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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.

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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.

Individual Parts

Results 1 - 25 of 79

Water Necks and Thermostat Housings, Gen III Hemi, Thermostat/Housing, 90 Degree, Swivel, Aluminum, Black, with Bolts, Chrysler, Dodge, 5.7-6.4L, Each

Part Number: HLY-97-341

Not Yet Reviewed

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Water Neck, OE Style, 90 Degrees, 3/8 in. Pipe, 1/4 in. Bolt Holes, with Plug and Gasket, Aluminum Construction, Natural Finish, Ford, Big Block, Each

Part Number: FSS-84859

3.5 out of 5 stars ( 18 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Water Neck Assembly, Swivel 45 Degree Angle, Aluminum, Black Anodized Finish, with Bolts, for 1 3/4 in. Hose, Chrysler, Dodge, Gen III Hemi, Each

Part Number: HLY-97-343

3.5 out of 5 stars ( 2 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Water Neck, Straight, Aluminum, Black, Anodizes, O-Ring, 2.875 in. Bolt Spacing, Dodge. Chrysler, Plymouth, LA, Each

Part Number: PGP-PRP-6728

Not Yet Reviewed

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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

Part Number: SUM-371100

4.53 out of 5 stars ( 100 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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

Part Number: SUM-370998

3.92 out of 5 stars ( 12 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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

Part Number: MRG-2661

4.5 out of 5 stars ( 36 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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

Part Number: SUM-G3801-3

4.27 out of 5 stars ( 11 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Water Neck, Steel, Chrome Plated, Straight Up, Mopar, Small Block LA, Polysphere, Big Block B/RB/Hemi, Each

Part Number: SUM-377806

3.6 out of 5 stars ( 35 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Thermostat Housing, Billet Aluminum, Natural, Chevrolet, Gen V LT, Each

Part Number: GRN-530000

Not Yet Reviewed

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Thermostat Housing Crossover, Aluminum, Ford, 351W, Cleveland Heads, Kit

Part Number: TFS-51600600

4.0 out of 5 stars ( 4 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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

Part Number: SUM-370998B

1.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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

Part Number: SPE-4933

4.58 out of 5 stars ( 12 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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

Part Number: SUM-G3801-2

4.0 out of 5 stars ( 14 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Thermostat Housing, O-Ring Style, Billet Aluminum, Natural, 160 Degree Thermostat, Chevrolet, Gen V LT, Each

Part Number: GRN-530160

Not Yet Reviewed

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Water Neck, Billet Aluminum, Clear Anodized, 90 Degree, Universal, Each

Part Number: CSI-99163

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Water Neck, Steel, Chrome Plated, O-Ring, 45 Degree, Ford, 260-302/351W, Each

Part Number: MRG-2662

3.92 out of 5 stars ( 26 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Water Neck, Cast Metal, Chrome Plated, 45 Degree, Chevy, Big/Small Block, Each

Part Number: SUM-G3800

4.38 out of 5 stars ( 29 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Water Neck, O-ring, Steel, Chrome, 45 degree, Ford, Small Block Windsor, Each

Part Number: SUM-G3805-1

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Water Neck, Thermostat Housing, 90 Degree, Chrome, Ford Small Block, SBF, Each

Part Number: SUM-370980

2.5 out of 5 stars ( 8 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

Water Neck, Steel, Chrome Plated, 45 Degree, Oldsmobile, V8, Each

Part Number: SUM-376003

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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