Drain Screw Gasket for Mercury/MerCruiser, Johnson/Evinrude & Force Lower Units – Replaces 12-19183 and 307552
Drain Screw Gasket for Mercury/MerCruiser, Johnson/Evinrude & Force Lower Units – Replaces 12-19183 and 307552 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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Drain Screw Gasket for Mercury/MerCruiser, Johnson/Evinrude & F...
Drain Screw Gasket for Mercury/MerCruiser, Johnson/Evinrude & Force Lower Units – Replaces 12-19183 and 307552 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket drain screw gasket is designed for lower-unit and stern-drive drain or fill screws using a 3/8-16 thread. It replaces commonly referenced Mercury/MerCruiser part number 12-19183 and Johnson/Evinrude part number 307552, along with the additional references listed below.
The gasket is intended for compatible Mercury and MerCruiser outboards and stern drives, Johnson/Evinrude outboard lower units, and Chrysler, Force, and US Marine outboard lower units that use the same 3/8-16 drain or fill screw and sealing arrangement. Always compare the original gasket, screw, thread size, and sealing surface before ordering.
- Provides a replacement sealing surface for lower-unit drain and fill screws.
- Rubber-coated stainless-steel construction is designed for durable, repeatable sealing.
- Replacing the gasket during each gearcase oil change helps reduce the risk of oil leakage and water intrusion.
Part Number Matrix
The following references are commonly associated with this replacement gasket. Confirm the number, dimensions, and application against your original part before installation.
| Brand | Part Number |
|---|---|
| Mercury | 12-19183 / 12-19183Q02 / 12-19183K02 / 12-191833 / 191832 / 19183 / 19183B / 20260B / 20260 |
| Johnson/Evinrude | 307552 / 300434 |
| Chrysler/Force/US Marine | F50556 / F8077 / F8186 |
| Sierra | 18-2244 / 18-2945 / 18-29451-9 |
| GLM | 31170 |
| Mallory | 9-60101 / 9-60102 |
| SEI Marine | 98-102-09 |
Engine and Model Compatibility
Fitment depends on the drain or fill screw and sealing surface, not only on the engine brand or model. The applications below are reference categories for units using a compatible 3/8-16 drain or fill screw. Confirm the original part before purchase.
Mercury/MerCruiser: Intended for compatible outboards, lower units, and stern drives using a 3/8-16 drain or fill screw. Japanese-origin Mercury models may use different components and require separate verification.
Johnson/Evinrude: Intended for compatible outboard lower units using a 3/8-16 drain or fill screw, including applications commonly associated with 307552.
Chrysler/Force/US Marine: Intended for compatible outboard lower units using a 3/8-16 drain or fill screw and the corresponding sealing surface.
| Brand | Model or Application | Rated HP | Stroke | Years | Reference Part No. | Fitment Condition |
|---|---|---|---|---|---|---|
| Mercury | Compatible outboard motors and lower units | Application dependent | 2-Stroke or 4-Stroke | Application dependent | 12-19183 | Requires a compatible 3/8-16 drain or fill screw; verify Japanese-origin models separately. |
| MerCruiser | Compatible stern drives and lower units | Application dependent | Not applicable | Application dependent | 12-19183 | Requires a compatible 3/8-16 drain or fill screw. |
| MerCruiser | 4.3L, 5.0L, 5.7L, and 6.2L applications | Application dependent | Not applicable | Application dependent | 12-19183 | Verify the actual drain-screw and gasket arrangement before ordering. |
| MerCruiser | 350, 377, and 383 MPI applications | Application dependent | Not applicable | Application dependent | 12-19183 | Verify the actual drain-screw and gasket arrangement before ordering. |
| Johnson/Evinrude | Compatible outboard lower units | Application dependent | 2-Stroke or 4-Stroke | Application dependent | 307552 | Requires a compatible 3/8-16 drain or fill screw. |
| Johnson/Evinrude | Multiple applications commonly associated with 307552 | 18–75 HP reference range | 2-Stroke or 4-Stroke | Application dependent | 307552 | Confirm the original gasket and screw before installation. |
| Chrysler/Force/US Marine | Compatible outboard lower units | Application dependent | 2-Stroke or 4-Stroke | Application dependent | F50556 / F8077 / F8186 | Requires a compatible 3/8-16 drain or fill screw. |
Technical Specifications
- Product Type
- Drain/fill screw gasket
- Application
- Lower-unit or stern-drive drain and fill screw sealing
- Compatible Thread Size
- 3/8-16 drain or fill screw
- Material
- Rubber-coated stainless steel
- Color
- Yellow newer-design or blue older-design appearance may be supplied
- Fitting Type
- Washer/gasket
- Replacement References
- Mercury 12-19183 and Johnson/Evinrude 307552, among other listed references
What's in the Box
- 1 x Drain screw gasket
Installation Notes
- Place a suitable drain pan beneath the lower unit's drain screw.
- Remove the drain or fill screw carefully and allow the old gearcase oil to drain completely.
- Remove and discard the old gasket.
- Clean the screw and the lower-unit sealing surface, removing oil residue, sealant, and debris.
- Place the new gasket onto the drain or fill screw.
- Reinstall the screw and tighten it to the engine or drive manufacturer's specified torque. Do not overtighten.
- Refill the lower unit with the correct gear lubricant through the fill port.
- Install the fill-port screw with a new compatible gasket and check both screw locations for leaks.
Troubleshooting and FAQ
How often should I replace this gasket?
Replacing the drain and fill screw gaskets whenever the gearcase oil is changed is recommended. Reusing a compressed or damaged gasket can increase the risk of oil leakage or water intrusion.
What is the difference between the yellow and blue gaskets?
The colors are associated with different design generations. They may be interchangeable only when the dimensions, material, and application match your original gasket. Do not rely on color alone to confirm fitment.
Will this gasket fit a Japanese-made Mercury outboard?
Not necessarily. Some Japanese-origin Mercury models may use different drain-screw components. Verify the original part number, thread, dimensions, and sealing surface before ordering.
What are the signs of a failing gasket?
Common signs include gear-lubricant leakage around the drain or fill screw and a milky or watery appearance in the gear oil, which may indicate water intrusion. Inspect the screw, gasket, and sealing surface together.
Is this an OEM part?
No. This listing is for an aftermarket replacement gasket. The listed OEM and aftermarket numbers are reference numbers used to help identify compatible applications; they do not change the product's aftermarket status.
What are your shipping speeds and costs?
Typical transit is 5–15 days for most regions. Standard shipping is free, and expedited options will appear at checkout when available for your location.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted within the standard return window for unused items in their original condition. Contact support for applicable instructions and order requirements.
Safety and Important Information
- Verify the original gasket, screw, dimensions, thread size, and sealing surface before ordering.
- Fitment should not be determined from engine brand or model alone; applications may vary by year, serial range, drive, and country of manufacture.
- This is an aftermarket replacement component, not an original equipment manufacturer part.
- Use the manufacturer's torque specification and the correct gear lubricant for your engine or stern drive.
- Professional installation is recommended when the sealing surface, screw threads, or gearcase condition is uncertain.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for demanding real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions with an average transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturing partners, we aim to provide fair pricing while maintaining dependable materials and quality control.
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