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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 55 Items.
Thermostat Housing, Toyota 4Runner 4.0L Low-Temp Racing Thermostat, 2003+
Part Number: MIO-MMTS4RUN4003
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat and Housing, 185 degree, Ford, 6.0L Powerstroke Diesel, Each
Part Number: MIO-MMTSF2D03CL
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, Mechanical, 154 degree, Standard-flow, for use on Acura®, Honda®, Each
Part Number: MIO-MMTS-CIV-06
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, 212 Degrees Opening Temp Rating, Copper/Stainless, Gasket, BMW, Each
Part Number: MIO-MMTS-F80-15
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Thermostat, Standard-flow, 160 degrees, Copper/Stainless Steel, Toyota, Each
Part Number: MIO-MMTS-TUN-07
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, Mechanical, Standard-flow, 154 degrees, Copper/Stainless Steel, Infiniti, Nissan, Suzuki, Each
Part Number: MIO-MTS-350Z-03L
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, 154.4 Degrees Opening Temp Rating, Copper/Stainless, Mazda, Each
Part Number: MIO-MMTS-MAZ-04
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, Mechanical, Standard-flow, 154 degrees, Copper/Stainless Steel, Nissan, GTR, Each
Part Number: MIO-MMTS-GTR-09
Not Yet Reviewed
Estimated Ship Date: Feb 13, 2026 if ordered today
Estimated Ship Date: Feb 13, 2026 if ordered today
Thermostat, Standard-flow, 140 degrees, Copper/Stainless Steel, for use on Acura®, Honda®, Each
Part Number: MIO-MMTS-RSX-02
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, 159.8 Degrees Opening Temp Rating, Copper/Stainless, Audi, Each
Part Number: MIO-MMTS-S4-10
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, 158 Degrees Opening Temp Rating, Copper/Stainless, Gasket, BMW, Each
Part Number: MIO-MMTSE4699V2
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, Mechanical, Standard-flow, 154 degrees, Copper/Stainless Steel, Infiniti, for Nissan, Each
Part Number: MIO-MMTS370Z10L
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, 206 Degrees Opening Temp Rating, Copper/Stainless, Gasket, BMW, Each
Part Number: MIO-MMTS-E46-99E
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, 154.4 Degrees Opening Temp Rating, Copper/Stainless, Ford, Each
Part Number: MIO-MMTS-FOC-05
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, 210.2 Degrees Opening Temp Rating, Copper/Stainless, Gasket, Each
Part Number: MIO-MMTS-GLF-15
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, 185 Degrees Opening Temp Rating, Copper/Stainless, Gasket, Volvo, Each
Part Number: MIO-MMTS-XC70-03
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, Standard-flow, 185 degrees, Copper/Stainless Steel, Ford, 6.0L Diesel, Each
Part Number: MIO-MMTS-F2D03FL
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, 154.4 Degrees Opening Temp Rating, Copper/Stainless, Lexus, Each
Part Number: MIO-MMTS-LEX-06
Not Yet Reviewed
Estimated Ship Date: Feb 12, 2026 if ordered today
Estimated Ship Date: Feb 12, 2026 if ordered today
Thermostat, Mechanical, Standard-flow, 154 degrees, Copper/Stainless Steel, Infiniti, for Nissan, 3.5L, Each
Part Number: MIO-MMTS-350Z-07
Not Yet Reviewed
Estimated Ship Date: Feb 13, 2026 if ordered today
Estimated Ship Date: Feb 13, 2026 if ordered today
Water Neck, Billet Aluminum, Low-Profile, Black, 1.500 in. Inlet, Chevy LSX Engines, 15 degree, Each
Part Number: MEZ-WN0019S
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Billet Aluminum, Low-Profile, Polished, 1.500 in. Inlet, Chevy LSX Engines, 15 degree, Each
Part Number: MEZ-WN0019U
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Billet Aluminum, Black Anodized, 0 Degree, Each
Part Number: MOR-63426
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Billet Aluminum, Black Anodized, Remote Mount, Each
Part Number: MOR-63425
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Black Anodized, 90 Degree, Chevy, Big/Small Block, Each
Part Number: MOR-63424
Estimated Ship Date: Today
Estimated Ship Date: Today
Water Neck, Aluminum, Natural, 90 Degree, Chevy, Small Block/Big Block, Each
Part Number: MOR-63420
Estimated Ship Date: Today
Estimated Ship Date: Today
