Mercury outboard spare part 878409A1 (O-RING KIT Includes Reference #26). Supplied by Dimo Marine for wholesale and export — genuine and quality aftermarket options available.
Fits 300X (3.0L) PRO MAX, 250XB (3.0L). Select a model tag above to open the exploded diagram and confirm the position.
Mercury outboard part 878409A1 (O-RING KIT Includes Reference #26), documented in 104 exploded diagram location(s), across the 2-STROKE-CARB, 2-STROKE-DFI-OPTIMAX, 2-STROKE-EFI, 4-STROKE-EFI series.
| Series | Model | Serial range | REF | Qty | Diagram |
|---|---|---|---|---|---|
| Mercury 2-STROKE-CARB | 110-jet-2-5l | 1B690542 THRU 1B974227 | 13 | 1 | View |
| Mercury 2-STROKE-CARB | 225-3-0l | 0G760300 THRU 0T408999 | 13 | 1 | View |
| Mercury 2-STROKE-CARB | 225-marathon-3-0l | 0G760300 THRU 0T408999 | 13 | 1 | View |
| Mercury 2-STROKE-CARB | 225-seapro-3-0l | 0G760300 THRU 0T408999 | 13 | 1 | View |
| Mercury 2-STROKE-CARB | v-140-international | 0T178500 THRU 1B226999 | 13 | 1 | View |
| Mercury 2-STROKE-CARB | v-150 | 0C100861 THRU 0C239552 | 13 | 1 | View |
| Mercury 2-STROKE-CARB | v-150 | 0C239553 THRU 0D081999 | 13 | 1 | View |
| Mercury 2-STROKE-CARB | v-150 | 0D082000 THRU 0G303045 | 13 | 1 | View |
| Mercury 2-STROKE-CARB | v-150 | 0G303046 THRU 0G760299 | 13 | 1 | View |
| Mercury 2-STROKE-CARB | v-150 | 0G760300 THRU 0G960499 | 13 | 1 | View |
| Mercury 2-STROKE-CARB | v-150 | 0G960500 THRU 1B226999 | 13 | 1 | View |
| Mercury 2-STROKE-CARB | v-150 | 4868998 THRU 0A904645 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 175-hp-pro-xs-6-cyl-2-5l | 1B516339 THRU 2B535624 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 175-hp-v6-cyl-2-5l | 0T178500 THRU 0T800999 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 175-hp-v6-cyl-2-5l | 0T801000 THRU 1B226999 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 175-hp-v6-cyl-2-5l | 1B227000 THRU 1B417701 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 175-hp-v6-cyl-2-5l | 1B417702 THRU 1B508457 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 2-5xs-2-5l | 0T997974 THRU 1E000796 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 200-hp-6-cyl-3-0l | 0G590000 THRU 0G760299 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 200-hp-6-cyl-3-0l | 0G760300 THRU 0G960499 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 200-hp-6-cyl-3-0l | 0G960500 THRU 0T178499 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 200-hp-6-cyl-3-0l | 0T178500 THRU 0T598999 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 200-hp-6-cyl-3-0l | 0T801000 THRU 1B417701 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 200-hp-6-cyl-3-0l | 1B417702 THRU 1B504988 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 200-hp-6-cyl-3-0l | 1B912786 THRU 2B535571 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 200-hp-dts-6-cyl-3-0l | 0T980000 THRU 1B417701 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 200-hp-dts-6-cyl-3-0l | 1B417702 THRU 1B504988 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 200-hp-dts-6-cyl-3-0l | 1B504989 THRU 1B964735 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 200-hp-pro-xs-6-cyl-3-0l | 1B912786 THRU 2B535571 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-6-cyl-3-0l | 0G590000 THRU 0G760299 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-6-cyl-3-0l | 0G760300 THRU 0G960499 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-6-cyl-3-0l | 0G960500 THRU 0T178499 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-6-cyl-3-0l | 0T178500 THRU 0T598999 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-6-cyl-3-0l | 0T801000 THRU 1B417701 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-6-cyl-3-0l | 1B417702 THRU 1B504988 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-dts-6-cyl-3-0l | 0T599000 THRU 1B417701 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-dts-6-cyl-3-0l | 1B417702 THRU 1B504988 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-dts-6-cyl-3-0l | 1B504989 THRU 1B964735 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-sport-xs-6-cyl-2-5l | 1E002584 THRU 1E050825 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-sport-xs-6-cyl-3-0l | 1E000797 THRU 1E002583 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 225-hp-xs-6-cyl-2-5l | 1E002584 THRU 1B792195 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 250-hp-pro-xs-6-cyl-3-0l | 1B426561 THRU 1B752546 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 250-hp-sport-xs-6-cyl-2-5l | 1E002342 THRU 1E051823 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 250-hp-sport-xs-6-cyl-2-5l | 1E051824 THRU 1E052994 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 250-hp-xs-6-cyl-3-0l | 0T651945 THRU 0T818042 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 250-hp-xs-6-cyl-3-0l | 0T818043 THRU 0T997973 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 250-hp-xs-6-cyl-3-0l | 1E000797 THRU 1E002341 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 250-hp-xs-6-cyl-3-0l | 1E002342 THRU 1E051113 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 250-hp-xs-6-cyl-3-0l | 1E053158 THRU 1E053958 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 3-0l-dsi-diesel-spark-ignition | 1E052967 THRU 1E054191 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | 300-hp-xs-6-cyl-3-2l | 1E001867 THRU 1E052057 | 13 | 1 | View |
| Mercury 2-STROKE-DFI-OPTIMAX | jp-3-0l | 0T997974 THRU 1E003045 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 200-3-0l | 0T750164 THRU 0T800999 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 200-3-0l | 0T801000 THRU 1B417701 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 200-3-0l | 1B417702 THRU 1B504988 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 200-3-0l | 1B504989 THRU 2B528096 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 200-efi-pro-max-super-mag | 0D935000 THRU 0G610079 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 225-3-0l | 0G760300 THRU 0T408999 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 225-3-0l | 0T801000 THRU 1B417701 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 225-3-0l | 1B417702 THRU 1B504988 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 225-3-0l | 1B504989 THRU 2B528096 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 225-3-0l-marathon | 0T801000 THRU 1B417701 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 225-3-0l-seapro | 0T801000 THRU 1B417701 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 225x-efi-promax | 0T430254 THRU 0T819605 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 250-3-0l | 0G129222 THRU 0G760299 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 250-3-0l | 0G760300 THRU 0T408999 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 250-3-0l | 0T409000 THRU 0T800999 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 250-3-0l | 0T801000 THRU 1B417701 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 250-3-0l | 1B417702 THRU 1B504988 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 250-3-0l | 1B504989 THRU 2B528096 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 250-l-3-0l | 0T861319 THRU 1B118897 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 250xb-3-0l | 0G980600 THRU 0T800999 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 3-0l-marathon | 0T409000 THRU 0T800999 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 3-0l-seapro | 0T409000 THRU 0T800999 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 300x-3-0l-pro-max | 0T235084 THRU 0T429939 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | 300x-3-0l-pro-max | 0T429940 THRU 0T999587 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | v-150-hp | 0G960500 THRU 0T408999 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | v-150-hp-2-5l | 0T801000 THRU 1B226999 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | v-150-hp-2-5l | 1B227000 THRU 2B121048 | 13 | 1 | View |
| Mercury 2-STROKE-EFI | v-150-hp-mag | 0D082000 THRU 0G303045 | 13 | 1 | View |
Another 24 location(s) are recorded but not listed here. Use the model links above to open the matching diagram.
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