Chev Stainless Steel Mercruiser Thermostat Housing Replaces 860256A4 Sierra 18-1989 and 18-3530-1 ronstan ratchet orbit block series 55 - fiddle becket cleat swivel Mounts with 2 studs (same

Mounts with 2 studs (same as megaphone style)

Helps maintain optimum efficiency and recommended to be used with distilled water

- Round design optimises space on board

While using USB as a power option

"Extreme" black foam float

Chev Stainless Steel Mercruiser Thermostat Housing Replaces 860256A4 Sierra 18-1989 and 18-3530-1 ronstan ratchet orbit block series 55 - fiddle becket cleat swivel Mounts with 2 studs (sameFor 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