Used on main bearing lube oil header to base on model 251f 18 cylinder alco diesel engine onboard 270 ft wmec coast guard vessels. 0.687" hole diameter 7.750" outside diameter 4 bolt hole quantity square shape notch cut into gasket on inner diameter circular
Used on base cover with bar-gear end in alco model 251f-18 cylinder diesel engine onboard 270 ft wmec coast guard vessels. 11.250" overall length 6.250" overall width non-circular