O-Ring – Volvo Penta (Replaces 333572)
O-Ring – Volvo Penta (Replaces 333572) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
O-Ring – Volvo Penta (Replaces 333572)
Product Details
This high-quality O-Ring for Volvo Penta engines serves as a crucial seal for oil drain plugs and fillers. It is designed to fit a wide range of Volvo Penta Saildrives (including MS25, 110S-150S series) and DP-G sterndrives, as well as various Evinrude/Johnson/OMC (6–225 HP) and Mercury Marine models, ensuring a precise fit and reliable performance.
This part directly replaces OEM and aftermarket numbers including Sierra Marine 18-7145, Evinrude Johnson OMC BRP 333572, Mercury Marine 64068, and GLM 81080.
- Installation: Used for the oil drain plug on many upper and lower gearcases and as the oil filler O-ring on select DP-G sterndrives.
- Dimensions: Approximately 6-7mm in diameter, engineered for a secure seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Sierra Marine | 18-7145 |
| Sierra Marine | 18-7145-9 |
| Evinrude Johnson OMC BRP | 333572 |
| Mercury Marine | 64068 |
| GLM | 81080 |
| GLM | 31171 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This O-ring is confirmed to fit a broad range of Volvo Penta saildrives and sterndrives as detailed in the comprehensive list.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Volvo Penta | MS25S | 3855081 | Some models |
| Volvo Penta | MS25S-A | 3855081 | Some models |
| Volvo Penta | MS25S-R | 3855081 | Some models |
| Volvo Penta | 110S | 3855081 | |
| Volvo Penta | 120S | 3855081 | |
| Volvo Penta | 120S-B | 3855081 | |
| Volvo Penta | 120S-D | 3855081 | |
| Volvo Penta | 120S-E | 3855081 | Some models |
| Volvo Penta | 130S | 3855081 | |
| Volvo Penta | 130S-A | 3855081 | |
| Volvo Penta | 130S-B | 3855081 | |
| Volvo Penta | 130S-C | 3855081 | |
| Volvo Penta | 130SR | 3855081 | |
| Volvo Penta | 130SR-A | 3855081 | |
| Volvo Penta | 130SR-B | 3855081 | |
| Volvo Penta | 130SR-C | 3855081 | |
| Volvo Penta | 130SR-D | 3855081 | |
| Volvo Penta | 150S | 3855081 | |
| Volvo Penta | 150S-A | 3855081 | |
| Volvo Penta | 150S-B | 3855081 | |
| Volvo Penta | 150S-C | 3855081 | |
| Volvo Penta | 150S-D | 3855081 | |
| Volvo Penta | 150SR | 3855081 | |
| Volvo Penta | 150SR-A | 3855081 | |
| Volvo Penta | 150SR-B | 3855081 | |
| Volvo Penta | 150SR-C | 3855081 | |
| Volvo Penta | 150SR-D | 3855081 | |
| Volvo Penta | SX-A | 3855081 | |
| Volvo Penta | SX-C | 3855081 | |
| Volvo Penta | SX-C1 | 3855081 | |
| Volvo Penta | SX-C2 | 3855081 | |
| Volvo Penta | SX-CT1 | 3855081 | |
| Volvo Penta | SX-CT2 | 3855081 | |
| Volvo Penta | SX-D | 3855081 | |
| Volvo Penta | SX-M | 3855081 | |
| Volvo Penta | SX-M1 | 3855081 | |
| Volvo Penta | SX-MTD | 3855081 | |
| Volvo Penta | SX-MTD3 | 3855081 | |
| Volvo Penta | SX-RT1 | 3855081 | |
| Volvo Penta | SX-RT2 | 3855081 | |
| Volvo Penta | SX-S | 3855081 | |
| Volvo Penta | SX-ST | 3855081 | |
| Volvo Penta | DPS-A | 3855081 | |
| Volvo Penta | DPS-A OXI | 3855081 | |
| Volvo Penta | DPS-B | 3855081 | |
| Volvo Penta | DPS-B OX | 3855081 | |
| Volvo Penta | DPS-B1 | 3855081 | |
| Volvo Penta | DPS-B1 OX | 3855081 | |
| Volvo Penta | DPS-D | 3855081 | |
| Volvo Penta | DPS-D OX | 3855081 | |
| Volvo Penta | DPS-D1 | 3855081 | |
| Volvo Penta | DPS-D1 OX | 3855081 | |
| Volvo Penta | DP-G | 3855081 | For Oil Filler |
| Volvo Penta | DP-C Sterndrive | 3855081 | |
| Volvo Penta | DP-D Sterndrive | 3855081 | |
| Volvo Penta | DP-E Sterndrive | 3855081 | |
| Volvo Penta | DP-H Sterndrive | 3855081 | |
| Volvo Penta | DPI Sterndrive | 3855081 | |
| Volvo Penta | DP-R Sterndrive | 3855081 | |
| Volvo Penta | DP-SM Sterndrive | 3855081 | |
| Volvo Penta | DP-X Sterndrive | 3855081 | |
| Volvo Penta | DP-S | 3855081 | |
| Volvo Penta | DP-S1 | 3855081 | |
| Volvo Penta | DP-SMTD | 3855081 | |
| Volvo Penta | DP-SMTD1 | 3855081 | |
| Volvo Penta | DP-SMTD3 | 3855081 | |
| Volvo Penta | DPX-A | 3855081 | |
| Volvo Penta | FWD-B1 | 3855081 | |
| Volvo Penta | FWD-B2 | 3855081 | |
| Volvo Penta | FWD-D1 | 3855081 | |
| Volvo Penta | FWD-D1 OX | 3855081 | |
| Volvo Penta | FWD-D2 | 3855081 | |
| Volvo Penta | FWD-D2 OX | 3855081 | |
| Volvo Penta | TSK A-32 | 3855081 | |
| Volvo Penta | TSK A-32-NPT | 3855081 | |
| Volvo Penta | TSK A-42 | 3855081 | |
| Volvo Penta | TSK A-42-NPT | 3855081 | |
| Volvo Penta | TSK A-52 | 3855081 | |
| Volvo Penta | TSK A-52-NPT | 3855081 | |
| Volvo Penta | TSK A-AC-32 | 3855081 | |
| Volvo Penta | TSK A-AC-42 | 3855081 | |
| Volvo Penta | TSK A-AC-52 | 3855081 | |
| Volvo Penta | TSK A-OX-32 | 3855081 | |
| Volvo Penta | TSK A-OX-42 | 3855081 | |
| Volvo Penta | TSK A-OX-52 | 3855081 | |
| Volvo Penta | TSK B-32 | 3855081 | |
| Volvo Penta | TSK B-42 | 3855081 | |
| Volvo Penta | TSK B-42-NPT | 3855081 | |
| Volvo Penta | TSK B-52 | 3855081 | |
| Volvo Penta | TSK B-52-NPT | 3855081 | |
| Volvo Penta | TSK B-AC-32 | 3855081 | |
| Volvo Penta | TSK B-AC-42 | 3855081 | |
| Volvo Penta | TSK B-AC-52 | 3855081 | |
| Volvo Penta | TSK B-OX-32 | 3855081 | |
| Volvo Penta | TSK B-OX-42 | 3855081 | |
| Volvo Penta | TSK B-OX-52 | 3855081 | |
| Volvo Penta | TSK DP-G | 3855081 | |
| Volvo Penta | TSK SX-A | 3855081 | |
| Volvo Penta | TSK SX-AAC | 3855081 | |
| Volvo Penta | TSK SX-AACLT32 | 3855081 | |
| Volvo Penta | TSK SX-AACLT42 | 3855081 | |
| Volvo Penta | TSK SX-ALT32 | 3855081 | |
| Volvo Penta | TSK SX-ALT42 | 3855081 | |
| Volvo Penta | TSK SX-C | 3855081 | |
| Volvo Penta | TSK SX-C1 | 3855081 | |
| Volvo Penta | TSK SX-C1AC | 3855081 | |
| Volvo Penta | TSK SX-C2AC | 3855081 | |
| Volvo Penta | TSK SX-CLT1 | 3855081 | |
| Volvo Penta | TSK SX-M | 3855081 | |
| Volvo Penta | TSK SX-MAC | 3855081 | |
| Volvo Penta | TSK SX-MACLT | 3855081 | |
| Volvo Penta | TSK SX-MBAC | 3855081 | |
| Volvo Penta | TSK SX-MDA | 3855081 | |
| Volvo Penta | TSK SX-MDB | 3855081 | |
| Volvo Penta | TSK SX-MDC | 3855081 | |
| Volvo Penta | TSK SX-MHP | 3855081 | |
| Volvo Penta | TSK SX-MLT | 3855081 | |
| Volvo Penta | TSK SX-OXI-AACL | 3855081 | |
| Volvo Penta | TSK SX-OXI-ACC | 3855081 | |
| Volvo Penta | TSK SX-OXI-ACCL | 3855081 | |
| Volvo Penta | TSK SX-R | 3855081 | |
| Volvo Penta | TSK SX-R1 | 3855081 | |
| Volvo Penta | TSK SX-R2 | 3855081 | |
| Volvo Penta | TSK X-B | 3855081 | |
| Volvo Penta | TSK X-BLT | 3855081 | |
| Volvo Penta | TSK XHP-B | 3855081 | |
| Volvo Penta | TSK XHP-BLT | 3855081 | |
| Volvo Penta | TSK XXP-A | 3855081 | |
| Volvo Penta | TSK XXP-ALT | 3855081 | |
| Volvo Penta | TSK XXP-D3 | 3855081 | |
| Volvo Penta | TSK-A-AC-32-NPT | 3855081 | |
| Volvo Penta | TSK-A-AC-42-NPT | 3855081 | |
| Volvo Penta | TSK-A-AC-52-NPT | 3855081 | |
| Volvo Penta | TSK-B-AC-42-NPT | 3855081 | |
| Volvo Penta | TSK-B-AC-52-NPT | 3855081 | |
| Volvo Penta | TSK-C-32 | 3855081 | |
| Volvo Penta | TSK-C-32-NPT | 3855081 | |
| Volvo Penta | TSK-C-42 | 3855081 | |
| Volvo Penta | TSK-C-42-NPT | 3855081 | |
| Volvo Penta | TSK-C-52 | 3855081 | |
| Volvo Penta | TSK-C-52-NPT | 3855081 | |
| Volvo Penta | TSK-C-AC-32 | 3855081 | |
| Volvo Penta | TSK-C-AC-32-NPT | 3855081 | |
| Volvo Penta | TSK-C-AC-42 | 3855081 | |
| Volvo Penta | TSK-C-AC-42-NPT | 3855081 | |
| Volvo Penta | TSK-C-AC-52 | 3855081 | |
| Volvo Penta | TSK-C-AC-52-NPT | 3855081 | |
| Volvo Penta | TSK-C-OX-32 | 3855081 | |
| Volvo Penta | TSK-C-OX-42 | 3855081 | |
| Volvo Penta | TSK-C-OX-52 | 3855081 | |
| Volvo Penta | XDP-B | 3855081 | |
| Volvo Penta | XDP-D3 | 3855081 |
It also fits a wide variety of Evinrude, Johnson, and OMC applications.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Evinrude/Johnson | Outboards | 6–225 | Varies | 333572 |
| OMC | Outdrives | 3.0–7.40 Liter | Varies | 333572 |
Technical Specs
- Product Type
- O-Ring
- Application
- Oil drain plug on upper and lower gearcases, oil filler on DP-G sterndrives
- Inside Diameter
- 6.35 mm (0.250 in)
- Cross-Section Width
- 2.54 mm (0.100 in)
- Package Dimensions
- 9.0 cm L x 7.0 cm W x 0.1 cm H
What’s in the Box
- 1 x O-Ring (replaces 3855081)
Installation Notes
For installation, ensure the sealing surfaces are clean and free of old gasket material or debris. Lightly lubricate the new O-ring with fresh gear oil before placing it in its groove. Tighten the drain or filler plug to the manufacturer's recommended torque specification to prevent leaks without overtightening.
Troubleshooting & FAQ
Where is this O-ring installed?
This O-ring is primarily used for the oil drain plug on the upper and lower gearcases of many Volvo Penta saildrives and sterndrives. It is also used as the oil filler seal on DP-G sterndrive models.
How can I confirm this part fits my specific engine model?
The most reliable method is to cross-reference your engine's model number and year with the compatibility tables provided on this page. Also, compare the part number (333572 or 3855081) to the one listed in your engine's service manual.
What are the signs of a failing drain plug O-ring?
The most common sign is a visible gear oil leak or seepage around the drain plug. A worn, cracked, or compressed O-ring can no longer create a proper seal, leading to fluid loss.
How often should this O-ring be replaced?
It is best practice to replace the drain plug O-ring every time you change the gearcase oil. This ensures a fresh seal and helps prevent leaks. They are a low-cost preventative maintenance item.
What are the exact dimensions of this O-ring?
This O-ring has an inside diameter (I.D.) of 6.35 mm (0.250 inches) and a cross-section width of 2.54 mm (0.100 inches).
Can this O-ring be used for fuel system applications?
No, this O-ring is specified for gear oil and lubrication systems. Using it in a fuel system is not recommended, as the materials may not be resistant to gasoline or diesel, which could cause it to degrade and fail.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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