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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 208

Thermostat Housing, Remote, Aluminum, Natural, Gasket Sealing Style, 1.250 in. Inlet/Outlet Size, Each

Part Number: SUM-3701250

1.0 out of 5 stars ( 1 )

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Thermostat Housing, Remote, Aluminum, Natural, Gasket Sealing Style, 1.500 in. Inlet/Outlet Size, Each

Part Number: SUM-3701500

1.0 out of 5 stars ( 1 )

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Thermostat Housing, Remote, Aluminum, Natural, Gasket Sealing Style, -20 AN Inlet/Outlet Size, Each

Part Number: SUM-370020

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Water Neck, Thermostat Housing, Billet, Big/Small Block, Chevy, 75 Degree, Each, O-Ring, Black

Part Number: MCH-BTH-204-08

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Water Neck, Thermostat Housing, Billet, Big/Small Block, Chevy, 75 Degree, Each, O-Ring, Polished

Part Number: MCH-BTH-204-05

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Water Neck, Thermostat Housing, Billet, Big/Small Block, Chevy, 75 Degree, Each, O-Ring, Clear Coat

Part Number: MCH-BTH-204

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Estimated Ship Date: Mar 11, 2026 if ordered today

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Estimated Ship Date: Mar 11, 2026 if ordered today

Water Neck, Thermostat Housing, Aluminum, Natural, Gasket Style, Each

Part Number: RNB-902-2009

4.53 out of 5 stars ( 17 )

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Water Neck, Thermostat Housing, Aluminum, Natural, Gasket Style, Each

Part Number: RNB-902-2014

4.17 out of 5 stars ( 6 )

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

Part Number: MRG-2660

3.5 out of 5 stars ( 2 )

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Water Neck, Replacement, Buick, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: FSS-84842

4.25 out of 5 stars ( 16 )

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Water Neck, Water Outlet, Stock, Aluminum, Stock, Pontiac, V8, L4, Each

Part Number: ADO-15-10282

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Water Neck, Replacement, Buick, Cadillac, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: FSS-84841

2.33 out of 5 stars ( 6 )

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Water Neck, Stock Style, OE Style, Buick, Chevy, GMC, Oldsmobile, Pontiac, Jeep, Each

Part Number: FSS-84853

4.13 out of 5 stars ( 8 )

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Water Neck, Replacement, Buick, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: FSS-84852

5.0 out of 5 stars ( 1 )

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Water Neck, 0 degree, Aluminum, Polished, O-Ring Sealing Style, Chevy, Small Block, Each

Part Number: CLP-CP6002

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Water Neck, Replacement, Chevy, GMC, Oldsmobile, Each

Part Number: FSS-84993

3.0 out of 5 stars ( 4 )

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Water Neck, Replacement, Chevy, GMC, Pontiac, Each

Part Number: FSS-84811

2.5 out of 5 stars ( 2 )

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Water Neck, Replacement, Aluminum, Natural, Each

Part Number: FSS-84844

2.5 out of 5 stars ( 4 )

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Water Neck, Cast Aluminum, Chevy, GMC, 5.0, 5.7L, Each

Part Number: FSS-84992

3.33 out of 5 stars ( 6 )

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Water Neck, 90 degree, Billet Aluminum, Clear Anodized, Buick, Chevy, GMC, Pontiac, Chevy Small Block, Each

Part Number: CVS-TSH4CL

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Apr 6, 2026 if ordered today

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Estimated Ship Date: Apr 6, 2026 if ordered today

Water Neck and Thermostat Housing, Billet Aluminum, Natural, Straight Up, Chevy, LS, Each

Part Number: ICB-551836-LS3ST

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Straight Thermostat Housing For LS Gen 3 Water Pump

Part Number: ICB-551836-LS1ST

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Water Neck and Thermostat Housings, Billet Aluminum, Natural, Straight Up, -16 AN Male Threads, Chevy, LS, Each

Part Number: ICB-551836-LS316

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Water Neck and Thermostat Housings, Billet Aluminum, Natural, Straight Up, -20 AN Male Threads, Chevy, LS, Each

Part Number: ICB-551836-LS320

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