Chev Stainless Steel Mercruiser Thermostat Housing Replaces 860256A4 Sierra 18-1989 and 18-3530-1 waterhose Fastens using four locking tabs

Fastens using four locking tabs fixed to switch

Removable cover plate

while the seat slide allows for approximately 125mm of fore and aft travel

Before installation

The transparent housing allows for effortless inspection and maintenance

Chev Stainless Steel Mercruiser Thermostat Housing Replaces 860256A4 Sierra 18-1989 and 18-3530-1 waterhose Fastens using four locking tabsFor use in Big Block and Small Block Chevy Mercruiser Applications Constructed of Cast Stainless Steel. Replaces factory black cast iron MerCruiser housing. Designed to work in conjunction with the factory circulating pump. Can be used in low profile applications such as EFI engines etc. Thermosat NOT Included. Works with Mercruiser 860256A4 MCM & MIE V6 V8 (305 & 350cid) w Bravo Drive Replaces Sierra 18 1989 and 18 3530 1