# 420850502 Sea-Doo O-Ring | Genuine OEM BRP Part

🔧 Product Description

  

Genuine Sea-Doo Oil Filter Housing O-Ring - Part Number: 420850502

  

A genuine BRP oil-filter housing O-ring used on numerous 1503 and 1630 Rotax 4-TEC lubrication systems. It seals the inner filter-housing or cover interface around the replaceable oil-filter element.

  

⚙️ Key Features

  

• Genuine BRP engine-oil sealing O-ring

• Correct size and elastomer for the 4-TEC filter housing

• Resistant to hot synthetic engine oil and pressure cycling

• Recommended replacement whenever the housing joint is opened

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 420850502 → supersedes 420850500

• 420850500 → earlier filter-housing O-ring reference

  

OEM / Related Numbers:

  

• 420850502

• 420850500

• 420230923 - related outer filter-cover O-ring

• 420950860 - related filter sealing ring on selected assemblies

  

Aftermarket / Verified Equivalents:

  

• Aftermarket 1503/1630 oil-filter O-ring sets commonly include 420850502

• Generic O-rings should not be used without confirming size and oil-resistant material

  

🚤 Compatibility

  

Commonly used on:

  

• GTI, GTS, GTR and GTX 1503/1630 models

• RXP, RXT and Wake 1503/1630 models

• Selected Sea-Doo 4-TEC jet boats

• Only lubrication assemblies whose diagram specifies 420850502

  

Typically suits:

  

• HP Range: Approximately 130-325 HP across supported engines

• Engine / Drive Type: 1503 cc or 1630 cc Rotax 4-TEC/ACE lubrication system

• Year Range: Approximately 2004 onward, engine revision dependent

• Serial / Model Identification: Confirm the oil-filter housing diagram and original O-ring number before installation.

  

🔌 Function

  

Seals the oil-filter housing joint to retain engine oil and oil-system pressure.

  

Common signs replacement or service is required:

  

• Oil leakage around the filter housing

• O-ring is flattened, swollen, brittle or cut

• Oil-pressure warning appears after filter service

• Seal has been pinched or installed in the wrong groove

  

📦 Condition

  

• Genuine Sea-Doo / BRP OEM part

• Brand new

• Supplied in genuine BRP or equivalent protective packaging

## Details

- **Price:** 6.95 AUD
- **Vendor:** Seadoo
- **Tags:** Sea-Doo Parts | Jet Ski Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 6.95 AUD | In stock |

## Images

- 420850502 Sea-Doo O-Ring | Genuine OEM BRP Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/420850502-o-ring)
> Updated: 2026-08-01