0.250" hole diameter 15.180" overall length 10.720" overall width gasket, rectifier inlet duct there is a smaller rectangle gasket that ia attach to main gasket; 9.080X5.210"; there are 30 bolts holes in the gasket rectangular
Used on must accommodate a 24 x 1.5 mm machine screw and is sea water and heat resistant from -20 to +80 degrees celsius. 22.0mm outside diameter o-ring circular