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 need

Many 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 Selector

If 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 #	Application	Replaces OEM Part #	I.D.	Width	Qty.	Model
18-7102-9	GLM	80130	0.430″	0.065″	5	10518942
18-7102- 9	Johnson/Evinrude OB	307450	0.430″	0.065″	5	10518942
18-7102- 9	Mallory	9- 765220	0.430″	0.065″	5	10518942
18-7102-9	Mercruiser Stern Drive	25-62706	0.430″	0.065″	5	10518942
18- 7102-9	Mercury Marine	25- 62706	0.430″	0.065″	5	10518942
18-7102-9	OMC Stern Drive	307450	0.430″	0.065″	5	10518942
18-7102- 9	Volvo Penta	3852073	0.430″	0.065″	5	10518942
18-7188- 9	Mallory	9- 76559	0.361″	0.064″	5	10519437
18-7188-9	Mercruiser Stern Drive	25-805726	0.361″	0.064″	5	10519437
18- 7188-9	Mercury Marine	25- 805726	0.361″	0.064″	5	10519437
18-7188-9	Mercury Sport Jet	25-805726	0.361″	0.064″	5	10519437
18-7188 -9	Volvo Penta	955983	0.361″	0.064″	5	10519437
18-7180-9	GLM	45030	0.445″	0.090″	5	10519361
18-7180- 9	Johnson/Evinrude OB	303347	0.445″	0.090″	5	10519361
18-7180- 9	Mallory	9- 76556	0.445″	0.090″	5	10519361
18-7180-9	Mercruiser Stern Drive	12-31060	0.445″	0.090″	5	10519361
18- 7180-9	Mercury Marine	25- 26802	0.445″	0.090″	5	10519361
18-7180-9	Volvo Penta	925055	0.445″	0.090″	5	10519361
18-7116	GLM	81100	0.360″	0.100″	1	10517902
18- 7116	Johnson/Evinrude OB	303067	0.360″	0.100″	1	10517902
18- 7116	Mallory	9- 43631	0.360″	0.100″	1	10517902
18-7116	Mercruiser Stern Drive	802206	0.360″	0.100″	1	10517902
18- 7116	Mercury Marine	25- 85148	0.360″	0.100″	1	10517902
18-7116	OMC Stern Drive	303067	0.360″	0.100″	1	10517902
18-7116	Volvo Penta	3852045	0.360″	0.100″	1	10517902
18- 7135	GLM	82100	0.750″	0.135″	1	10518066
18- 7135	Johnson/Evinrude OB	310584	0.750″	0.135″	1	10518066
18- 7135	Mallory	9- 76530	0.750″	0.135″	1	10518066
18-7135	Mercruiser Stern Drive	25-35276	0.750″	0.135″	1	10518066
18- 7135	Mercury Marine	25- 20365	0.750″	0.135″	1	10518066
18-7135	OMC Stern Drive	310584	0.750″	0.135″	1	10518066
18-7135	Volvo Penta	3852089	0.750″	0.135″	1	10518066

Select a Product	18-7116 Outboard O-Ring, 18-7135 Outboard O-Ring, 18-7102 Outboard O-Ring, 5-Pack, 18-7180 Outboard O-Ring, 5-Pack, 18-7188 Outboard O-Ring, 5-Pack