Thermostat Housing Lower Mercruiser 4.3 5.0 5.7 1983-Newer 87290A4

Lower Thermostat Housing for Mercruiser GM V6 and GM small block V8, engines with center riser manifolds.
Used with engines that have a two hose bib top cover and usually has a Tee Ball Valve screwed in the threaded hole on top.
OEM: Mercruiser # 87290A4
Fits models V6/4.3, 305/5.0, 350/5.7.