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 Johnson/Evinrude 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 #	Manufacturer	OEM Part #	I.D.	Width	Qty.	Model
18-7101- 9	GLM	80100	0.250″	0.065″	5	10518934
18-7101- 9	Johnson/Evinrude Outboard	305739	0.250″	0.065″	5	10518934
18-7101- 9	OMC Stern Drive	305739	0.250″	0.065″	5	10518934
18-7139- 9	GLM	83200	1.080″	0.210″	5	10519064
18-7139- 9	Johnson/Evinrude Outboard	319085	1.080″	0.210″	5	10519064
18-7139- 9	Mallory	9-43622	1.080″	0.210″	5	10519064
18 -7428-9	OMC Stern Drive	307103	N/A	N/A	2	10518892
18-7428- 9	Johnson/Evinrude Outboard	307103	N/A	N/A	2	10518892
18-7481- 9	GLM	86570	N/A	N/A	2	10518926
18-7481- 9	Johnson/Evinrude Outboard	324981	N/A	N/A	2	10518926
18-7481- 9	Mallory	9-43632	N/A	N/A	2	10518926
18-7416- 9	Johnson/Evinrude Outboard	329380	0.612″	0.103″	5	10519601
18-7416- 9	GLM	81140	0.612″	0.103″	5	10519601
18-7404- 9	Johnson/Evinrude Outboard	909747	0.300″	0.100″	5	10519510
18-7404- 9	GLM	81090	0.300″	0.100″	5	10519510
18-7404- 9	Mallory	9-76654	0.300″	0.100″	5	10519510
18 -7404-9	OMC Stern Drive	909747	0.300″	0.100″	5	10519510
18-7138- 9	GLM	83250	1.500″	0.210″	5	10519056
18-7138- 9	Mallory	9-76533	1.500″	0.210″	5	10519056
18 -7138-9	OMC Stern Drive	318717	1.500″	0.210″	5	10519056
18-7409- 9	GLM	81230	1.175″	0.100″	5	10519551
18-7409- 9	OMC Stern Drive	911871	1.175″	0.100″	5	10519551
18-7129- 9	GLM	80220	0.970″	0.065″	5	10519023
18-7129- 9	Johnson/Evinrude Outboard	314491	0.970″	0.065″	5	10519023
18-7129- 9	OMC Stern Drive	314491	0.970″	0.065″	5	10519023
18-7108- 9	GLM	81450	2.550″	0.100″	5	10518991
18-7108- 9	Johnson/Evinrude Outboard	313893	2.550″	0.100″	5	10518991
18-7108- 9	Mallory	9-76522	2.550″	0.100″	5	10518991
18 -7108-9	OMC Stern Drive	313893	2.550″	0.100″	5	10518991
18-7137- 9	GLM	45200	0.320″	0.155″	5	10519049
18-7137- 9	Johnson/Evinrude Outboard	318372	0.320″	0.155″	5	10519049
18-7137- 9	Mallory	9-76531	0.320″	0.155″	5	10519049
18 -7137-9	OMC Stern Drive	318372	0.320″	0.155″	5	10519049
18-7401- 9	GLM	81440	2.485″	0.100″	5	10519494
18-7401- 9	Mallory	9-76652	2.485″	0.100″	5	10519494
18 -7401-9	OMC Stern Drive	908383	2.485″	0.100″	5	10519494
18-7403- 9	GLM	81280	1.500″	0.100″	5	10519502
18-7403- 9	Mallory	9-76567	1.500″	0.100″	5	10519502
18 -7403-9	OMC Stern Drive	909316	1.500″	0.100″	5	10519502
18-7417- 9	GLM	81100	0.362″	0.103″	5	10519619
18-7417- 9	Johnson/Evinrude Outboard	329381	0.362″	0.103″	5	10519619
18-7418- 9	GLM	82460	4.484″	0.139″	5	10519627
18-7418- 9	Johnson/Evinrude Outboard	326741	4.484″	0.139″	5	10519627
18-7477- 9	GLM	41120	0.480″	0.100″	5	10519684
18-7477- 9	OMC Stern Drive	909048	0.480″	0.100″	5	10519684
18-7142- 9	Mallory	9-76536	3.940″	0.135″	5	10519098
18 -7142-9	OMC Stern Drive	322119	3.940″	0.135″	5	10519098
18- 7112	GLM	82170	1.170″	0.135″	5	10517878
18- 7112	Johnson/Evinrude Outboard	302493	1.170″	0.135″	5	10517878
18- 7112	OMC Stern Drive	302493	1.170″	0.135″	5	10517878
18- 7461	GLM	81290	1.612″	0.103″	5	10518694
18- 7461	Johnson/Evinrude Outboard	308458	1.612″	0.103″	5	10518694
18- 7461	OMC Stern Drive	308458	1.612″	0.103″	5	10518694
18- 7123	GLM	81400	2.235″	0.100″	5	10517977
18- 7123	Johnson/Evinrude Outboard	308876	2.235″	0.100″	5	10517977
18- 7123	OMC Stern Drive	308876	2.235″	0.100″	5	10517977
18- 7126	GLM	81310	1.690″	0.100″	5	10518009
18- 7126	Johnson/Evinrude Outboard	313340	1.690″	0.100″	5	10518009
18- 7126	OMC Stern Drive	313340	1.690″	0.100″	5	10518009
18- 7128	GLM	81340	1.835″	0.100″	5	10518025
18- 7128	Johnson/Evinrude Outboard	313754	1.835″	0.100″	5	10518025
18- 7128	Mallory	9- 76532	1.835″	0.100″	5	10518025
18-7128	OMC Stern Drive	313754	1.835″	0.100″	5	10518025
18- 7130	GLM	81380	2.125″	0.100″	5	10518041
18- 7130	Johnson/Evinrude Outboard	314728	2.125″	0.100″	5	10518041
18- 7130	Mallory	9- 76528	2.125″	0.100″	5	10518041
18-7130	OMC Stern Drive	314728	2.125″	0.100″	5	10518041
18- 7963	GLM	86660	N/A	N/A	5	10518827
18- 7963	Johnson/Evinrude Outboard	331353	N/A	N/A	5	10518827
18- 7963	Mallory	9-48217	N/A	N/A	5	10518827
18- 7963	OMC Stern Drive	331353	N/A	N/A	5	10518827
18- 7104-9	GLM	82280	2.210″	0.135″	5	10518967
18- 7104-9	Johnson/Evinrude Outboard	308627	2.210″	0.135″	5	10518967
18-7104- 9	Mallory	9-76521	2.210″	0.135″	5	10518967

Select a Product

18-7112 O-Ring Replaces OMC 302493, 18-7123 O-Ring Replaces OMC 308876, 18-7126 O-Ring Replaces: OMC 313340, 18-7128 O-Ring Replaces OMC 313754, 18-7130 O-Ring Replaces OMC 314728, 18-7461 O-Ring Replaces OMC 308458, 18-7963 O-Ring Replaces OMC 331353, 18-7428 O-Ring Replaces 307103, 2-Pack, 18-7481 O-Ring Replaces 324981, 2-Pack, 18-7104 O-Ring, 5-Pack, 18-7101 O-Ring Replaces 305739, 5-Pack, 18-7108 O-Ring, 5-Pack, 18-7129 O-Ring, 5-Pack, 18-7137 O-Ring, 5-Pack, 18-7138 O-Ring, 5-Pack, 18-7139 O-Ring, 5-Pack, 18-7142 O-Ring 5-Pack, 18-7401 O-Ring, 5-Pack, 18-7403 O-Ring, 5-Pack, 18-7404 O-Ring, 5-Pack, 18-7409 O-Ring, 5-Pack, 18-7416 O-Ring, 5-Pack, 18-7417 O-Ring, 5-Pack, 18-7418 O-Ring, 5-Pack, 18-7477 O-Ring, 5-Pack