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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 54 Items.
Straight Thermostat Housing For LS Gen 3 Water Pump
Part Number: ICB-551836-LS1ST
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
BUILD IT WITH SUMMIT!
Summit Racing™ Aluminum Water Necks SUM-370998
Water Neck, Thermostat Housing, Cast Aluminum, Polished, 60 Degree, Swivel, Chevrolet, LS, Each
Part Number: SUM-370998
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Clear Anodized, O-Ring, Straight, 1.500 in. Outlet, Chevy, LS1/LS2/LS6, Each
Part Number: HSE-4910-347-245
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Black Anodized, O-Ring, Straight, 1.500 in. Outlet, Chevy, LS1/LS2/LS6, Each
Part Number: HSE-4910-347-242
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck Outlet, Billet Aluminum, Polished, Straight, LS1, LS2, LS7, Each
Part Number: PQX-5234613
Not Yet Reviewed
Estimated Ship Date: Apr 30, 2026 if ordered today
Estimated Ship Date: Apr 30, 2026 if ordered today
Water Neck, Aluminum, Black Anodized, O-Ring, Straight, 1.250 in. Outlet, Chevy, LS1/LS2/LS6, Each
Part Number: HSE-4910-347-202
Not Yet Reviewed
Estimated Ship Date: Mar 18, 2026 if ordered today
Estimated Ship Date: Mar 18, 2026 if ordered today
Water Neck, Aluminum, Clear Anodized, O-Ring, Straight, 1.250 in. Outlet, Chevy, LS1/LS2/LS6, Each
Part Number: HSE-4910-347-205
Not Yet Reviewed
Estimated Ship Date: Mar 18, 2026 if ordered today
Estimated Ship Date: Mar 18, 2026 if ordered today
Water Neck, Aluminum, Blue Anodized, O-Ring, Straight, 1.250 in. Outlet, Chevy, LS1/LS2/LS6, Each
Part Number: HSE-4910-347-201
Not Yet Reviewed
Estimated Ship Date: Mar 18, 2026 if ordered today
Estimated Ship Date: Mar 18, 2026 if ordered today
Water Neck, Aluminum, Red Anodized, O-Ring, Straight, 1.250 in. Outlet, Chevy, LS1/LS2/LS6, Each
Part Number: HSE-4910-347-203
Not Yet Reviewed
Estimated Ship Date: Mar 18, 2026 if ordered today
Estimated Ship Date: Mar 18, 2026 if ordered today
Water Neck, Aluminum, Blue Anodized, O-Ring, Straight, 1.500 in. Outlet, Chevy, LS1/LS2/LS6, Each
Part Number: HSE-4910-347-241
Not Yet Reviewed
Estimated Ship Date: Mar 18, 2026 if ordered today
Estimated Ship Date: Mar 18, 2026 if ordered today
Need It Sooner? We recommend these similar substitute parts:
Redhorse Performance 4910 Series Thermostat Housing Assemblies 4910-347-24-2
Not Yet Reviewed
Estimated Ship Date: Today
Water Neck, Aluminum, Red Anodized, O-Ring, Straight, 1.500 in. Outlet, Chevy, LS1/LS2/LS6, Each
Part Number: HSE-4910-347-243
Not Yet Reviewed
Estimated Ship Date: Mar 18, 2026 if ordered today
Estimated Ship Date: Mar 18, 2026 if ordered today
Need It Sooner? We recommend these similar substitute parts:
Redhorse Performance 4910 Series Thermostat Housing Assemblies 4910-347-24-5
Not Yet Reviewed
Estimated Ship Date: Today
Water Neck, Aluminum, Black Anodized, Swivel, 60 Degree, Chevrolet, LS, Each
Part Number: MRG-2670BK
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, O-ring Sealing Style, Aluminum, Natural, 186 degree Thermostat, Buick, Cadillac, Chevy, GMC, Each
Part Number: ADO-15-11057
Estimated Ship Date: Today
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Thermostat Housing, Cast Aluminum, Black, 60 Degree, Swivel, Chevrolet, LS, Each
Part Number: SUM-370998B
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Chrome Plated, Swivel, 60 Degree, Chevrolet, LS, Each
Part Number: MRG-2670
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Polished, Straight Up, 1.50 in. Hose, GM, LS Engine, Each
Part Number: MRG-2671NA
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, LS Water Pump Adapter, Straight Up, Billet Aluminum, Clear Anodized, Chevy, Small Block LS, Kit
Part Number: EAR-LS0005ERL
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Chrome Plated, Straight Out, Chevrolet, LS, Each
Part Number: SUM-370990
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Chrome Plated, Swivel, 60 Degree, Chevrolet, LS, Each
Part Number: SUM-370995
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Thermostat Housing, Cast Aluminum, Polished, Straight, Chevrolet, LS, Each
Part Number: SUM-370997
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck and Thermostat Housing, Stock, Steel, Natural, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Pontiac, Each
Part Number: RNB-902-700
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Spec-R, Aluminum Natural, Chevy, Cadillac, GMC, Pontiac, Hummer, Each
Part Number: SNN-MRD102
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Thermostat Housing, Cast Aluminum, Copper Plated, 60 Degree, Swivel, Chevrolet, LS, Each
Part Number: SUM-370998CPR
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck and Thermostat Housing, Stock, Cast Aluminum, Natural, Chevrolet, GMC, Workhorse, Each
Part Number: RNB-902-836
Estimated Ship Date: Today
Estimated Ship Date: Today
