GLM Products Inc mercruiser, omc, volvo, penta, johnson, evinrude, mercury, mariner, force, sterdrive, manifold, riser, elbow, piston, gasket, engine, ignition, gearcase, transom, cooling, housing, components, exhaust, marine, speed, boat, jet, power, performance, precision, superior, quality, OEM, repair, service, dealer, distributor GLM is the leader in aftermarket marine engine parts. GLM products are completely compatible and interchangeable with the OEM.