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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 205 Items.
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
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Necks and Thermostat Housings, Replacement, Thermostat/Housing Assembly, GM LT4, Aluminum, 1.50 in. OD, with Mid-Mount Accessory Drive, Each
Part Number: HLY-97-247
Not Yet Reviewed
Estimated Ship Date: Feb 16, 2026 if ordered today
Estimated Ship Date: Feb 16, 2026 if ordered today
Water Neck Thermostat Housings, Replacement, Aluminum, 1.50 in. Outlet, O-ring Seal, with Thermostat, for LT/LS Mid-Mount Accessory Drive Only, Each
Part Number: HLY-97-169
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Engine Coolant Fail-Safe Thermostat Housing Assembly with Sensor and Seal
Part Number: SNN-TA2062SFS
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Black Anodized, O-Ring, 75 Degree, 1.500 in. Outlet, Ford, Small Block, Each
Part Number: HSE-4910-302-242
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Black Anodized, O-Ring, 75 Degree, 1.500 in. Outlet, With Filler Neck for Radiator Cap, Chevy, Small/Big Block, Each
Part Number: HSE-4910-383-242
Estimated Ship Date: Today
Estimated Ship Date: Today
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: Today
Estimated Ship Date: Today
Thermostat Housing, Billet Aluminum, Straight Up, Universal, Each
Part Number: MEZ-WN0072
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Black Anodized, O-Ring, 75 Degree, 1.500 in. Outlet, Ford, 426/460, Each
Part Number: HSE-4910-460-242
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Thermostat Housing, Billet Aluminum, Straight Up, Universal, Each
Part Number: MEZ-WN0071
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Clear Anodized, O-Ring, 75 Degree, 1.500 in. Outlet, Chevy, Small/Big Block, Each
Part Number: HSE-4910-350-245
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Black Anodized, O-Ring, 75 Degree, 1.500 in. Outlet, Chevy, Small/Big Block, Each
Part Number: HSE-4910-350-242
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Clear Anodized, O-Ring, 75 Degree, 1.500 in. Outlet, With Filler Neck for Radiator Cap, Chevy, Small/Big Block, Each
Part Number: HSE-4910-383-245
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, 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, Clear Anodized, O-Ring, 75 Degree, 1.500 in. Outlet, Ford, Small Block, Each
Part Number: HSE-4910-302-245
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Blue Anodized, O-Ring, 75 Degree, 1.500 in. Outlet, Ford, 426/460, Each
Part Number: HSE-4910-460-241
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Clear Anodized, O-Ring, 75 Degree, 1.250 in. Outlet, Chevy, Small/Big Block, Each
Part Number: HSE-4910-350-205
Not Yet Reviewed
Estimated Ship Date: Feb 10, 2026 if ordered today
Estimated Ship Date: Feb 10, 2026 if ordered today
Water Neck, Aluminum, Red Anodized, O-Ring, 75 Degree, 1.500 in. Outlet, Chevy, Small/Big Block, Each
Part Number: HSE-4910-350-243
Not Yet Reviewed
Estimated Ship Date: Feb 11, 2026 if ordered today
Estimated Ship Date: Feb 11, 2026 if ordered today
Need It Sooner? We recommend these similar substitute parts:
Water Neck, Aluminum, Black Anodized, O-Ring, 75 Degree, 1.500 in. Outlet, Dodge, Magnum Engines, Each
Part Number: HSE-4910-440-242
Not Yet Reviewed
Estimated Ship Date: Feb 10, 2026 if ordered today
Estimated Ship Date: Feb 10, 2026 if ordered today
Water Neck, Aluminum, Red Anodized, O-Ring, 75 Degree, 1.250 in. Outlet, With Filler Neck for Radiator Cap, Chevy, Small/Big Block, Each
Part Number: HSE-4910-383-203
Not Yet Reviewed
Estimated Ship Date: Feb 10, 2026 if ordered today
Estimated Ship Date: Feb 10, 2026 if ordered today
Water Neck, Aluminum, Black Anodized, O-Ring, 75 Degree, 1.250 in. Outlet, Ford, Small Block, Each
Part Number: HSE-4910-302-202
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Red Anodized, O-Ring, 75 Degree, 1.250 in. Outlet, Chevy, Small/Big Block, Each
Part Number: HSE-4910-350-203
Not Yet Reviewed
Estimated Ship Date: Feb 10, 2026 if ordered today
Estimated Ship Date: Feb 10, 2026 if ordered today
Water Neck, Aluminum, Blue Anodized, O-Ring, 75 Degree, 1.500 in. Outlet, Chevy, Small/Big Block, Each
Part Number: HSE-4910-350-241
Not Yet Reviewed
Estimated Ship Date: Feb 11, 2026 if ordered today
Estimated Ship Date: Feb 11, 2026 if ordered today
Need It Sooner? We recommend these similar substitute parts:
Water Neck, Aluminum, Clear Anodized, O-Ring, 75 Degree, 1.250 in. Outlet, Ford, Small Block, Each
Part Number: HSE-4910-302-205
Not Yet Reviewed
Estimated Ship Date: Feb 10, 2026 if ordered today
Estimated Ship Date: Feb 10, 2026 if ordered today
