PRODUCT DETAILS
Gear Oil Drain & Level Plug O-Ring Gasket Set for Honda Outboards
Premium-quality aftermarket gear oil drain plug and oil level/check plug O-ring seals for selected Honda 4-stroke outboard engines.
These small seals are fitted to the gearbox oil drain / level plugs and should be inspected when changing the lower-unit gear oil.
Designed as replacements for Honda part number 91301-ZW4-003.
Honda identifies this part as an O-Ring, 6.9 × 1.45 mm, and Honda gearcase diagrams show it fitted to the gearbox oil plug locations.
Fits Selected Honda Outboards
Suitable for a wide range of Honda 4-stroke outboards, including selected:
- 8 HP
- 10 HP
- 15 HP
- 20 HP
- 25 HP
- 30 HP
- 40 HP
- 50 HP
- 60 HP
- 75 HP
- 80 HP
- 90 HP
- 100 HP
- 115 HP
- 130 HP
- 135 HP
- 150 HP
- 175 HP
- 200 HP
- 225 HP
- 250 HP
Parts references list 91301-ZW4-003 across Honda 8–250 HP 4-stroke applications, with many applications from 2004 onwards.
Examples of Compatible Model Families
BF8, BF10, BF15, BF20, BF25, BF30, BF40, BF50, BF60, BFP60, BF75, BF80, BF90, BF100, BF115, BF130, BF135, BF150, BF175, BF200, BF225 & BF250
Replaces Honda Part Number
- 91301-ZW4-003
- 91301ZW4003
- HZW491301003
O-Ring Size
6.9 × 1.45 mm
OEM part numbers are used for identification and reference purposes only.
Product Features
- Gear oil drain plug O-ring / gasket
- Gear oil level / check plug seal
- For selected Honda outboard engines
- 8 HP–250 HP
- 4-stroke applications
- Size: 6.9 × 1.45 mm
- Ideal for routine gearbox oil servicing
- Helps provide the correct seal around the gear oil plugs
- Marine-grade quality aftermarket part
- Manufactured to OEM specifications
- Direct replacement for the corresponding OEM application
- New replacement parts
Important – Recommended During Gear Oil Changes
The gear oil drain and level plug seals are inexpensive service items but are important for maintaining a proper seal in the lower unit.
Honda parts diagrams show applications where two 91301-ZW4-003 O-rings are used in the gearcase, making them suitable for replacing the seals during a gearbox oil change.
Important – Please Check Compatibility
Please do not order by horsepower or appearance alone.
Honda has used different gearbox arrangements across its outboard range.
Before purchasing, please check:
- Exact engine model
- Engine year
- Gearcase arrangement
- Existing drain plug seal
- Original Honda part number
For the safest identification, check that your engine requires:
91301-ZW4-003
If the part looks the same as yours, this does not always mean it is the correct one for your outboard.
If you are unsure, please send us your engine model and serial number before purchasing and our technical team will be happy to check compatibility.
Why Buy From SSI Marine?
- Marine-grade aftermarket & OEM-spec parts
- Workshop-tested products
- More than 10 years supplying outboard parts
- UK stock
- Same working day dispatch before 1 PM Monday–Friday
- Royal Mail Tracked 24
- Technical support from experienced outboard specialists
- Collection available from Leigh, Greater Manchester
SHIPPING & DELIVERY
Delivery & Returns Policy
Delivery
Standard Delivery
- £6: Royal Mail Tracked 24 Service
- £3.99: Large Letter - Royal Mail 1st Class Post (Untracked)
We offer free delivery on all orders over £150 (excludes outboard engines).
Orders placed before 1:00 PM (Monday-Friday) are usually dispatched the same working day.
Most parcels are delivered within 24 hours, but please allow extra time for courier delays that may occur outside our control.
For outboard engines, please contact us for a delivery quote.
Important: Please ensure your shipping address is correct before completing checkout. SSI Marine is not responsible for parcels sent to an incorrect address provided by the buyer.
Tracking Your Order
Once your order has been dispatched, you will receive a tracking number via email (after 5 PM on the day of dispatch).
Tracking is available only for parcels sent via Royal Mail Tracked 24.
Large Letter orders are sent via Royal Mail 1st Class Post (untracked).
Returns
We accept returns of unused and undamaged items within 30 days of purchase.
Returned items must be in sellable condition and include the original packaging.
Please do not tape, label, or write directly on the product's original box.
Important: Do not return items in their original product boxes only, they must be placed inside a protective outer box or bag. Parcels returned like the example below will be subject to a 20% restocking fee.
Return shipping costs are the customer's responsibility.
Please include your order details and reason for return inside the parcel.
Refunds
Refunds are issued for the item purchase price only (shipping costs are non-refundable).
All refunds will be made using the same payment method as your original order.
Items returned in poor condition or without proper packaging may incur a 20% restocking fee.
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