Sierra Marine engine parts are designed to meet or exceed the OEM part they are intended to replace and they are backed by the SeaStar Solutions Two-Year Warranty—one of the best in the business.We offer a variety of O-rings, oil seals and seal kits for most engine applications on the water today—including MerCruiser, OMC, Johnson/Evinrude, Volvo and more.How to find the O-ring you needMany of the O-rings we offer fit multiple applications. Notice in the list below that in addition to Mercury Marine and OMC applications, there are a variety of other engine applications for the O-rings offered here. O-rings can also be selected by inside diameter and width, which also appear in the table.The Sierra Engine Parts SelectorIf you do not see the O-ring (or other engine part) you need, please visit the Sierra Engine Parts Selector, where you can search by engine make, model, serial number or year of manufacture.Sierra #ApplicationReplaces OEM Part #I.D.WidthQty.Model18-7102-9GLM801300.430"0.065"51051894218-7102- 9Johnson/Evinrude OB3074500.430"0.065"51051894218-7102- 9Mallory9- 7652200.430"0.065"51051894218-7102-9Mercruiser Stern Drive25-627060.430"0.065"51051894218- 7102-9Mercury Marine25- 627060.430"0.065"51051894218-7102-9OMC Stern Drive3074500.430"0.065"51051894218-7102- 9Volvo Penta38520730.430"0.065"51051894218-7188- 9Mallory9-