18-7170 Replacement O-Rings, 5-Pack
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SIERRA18-7170 Replacement O-Rings, 5-Pack


In stock online.
Model # 10519270 | Mfg # 18-7170-9UPC # 808282165482


18-7170 Replacement O-Rings, 5-Pack

Name Value
Compatibility Johnson/Evinrude (OMC/BRP/Cobra) 307239
Mercury/Mariner/Mercruiser 25-33504
Material Rubber
Type O-Rings

Product Overview

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 #ApplicationReplaces OEM Part #I.D.WidthQty.Model
18-7170-9Chrysler/Force/US Marine25-335041.365"0.135"510519270
18-7170-9Johnson/Evinrude Outboard3072391.365"0.135"510519270
18-7170-9Mercruiser Stern Drive25-335041.365"0.135"510519270
18-7170-9Mercury Marine25-335041.365"0.135"510519270
18-7170-9OMC Stern Drive307239, 38520711.365"0.135"510519270


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