Thermostat housing. Fits: 3.0L GM 181 L/4 (1999-Up). Direct replacement thermostat housing fits Mercruiser 120, 140, 120R, 140R, 160, 165 & 200 model 4 & inline 6 cylinder marine engines. Replaces: Mercruiser 861493A3, Marine Power 0214-000, and Barr Marine MC-29-47587.

Housing Kit includes Thermostat Spacer 4.3L/262ci to 8.2/502ci Raw Water Cooled (515645), Thermostat Housing (4.3L - 5.7L Raw Water Cooling System (542034), Gasket 4.3L / 5.7L / 7.4L Thermostat to Engine (280153), Brass Pipe Plugs x2.

Thermostat Housing used on Marine Power 4.3L - 5.7L Raw Water Cooling systems. Piece comes as raw metal with no paint or primer. Replaces: Mercruiser 860256A4. Does not have provisions for temp sensors. For kit see Part Number 542046.

Thermostat Housing used on Marine Power 5.7L Fresh Water Cooling systems. This housing is used in conjunction with Marine Power Number 511035 (Heat Exchanger). Includes Gaskets, Bolts And Washers, and Standard Size Radiator Cap Filler Neck. Outlet Angle - 180 Degree.

Thermostat Housing Neck used on Marine Power 5.7L Fresh Water Cooling systems. This housing is used in conjunction with Marine Power Part Number 511035 (heat exchanger). This neck flange accepts a standard radiator cap.