Royal Enfield UCE Oil Drain Cap / Suction Filter O-Ring – Classic, Bullet, Electra, Thunderbird & GT 535 – 570057/B

Genuine Royal Enfield 570057/B is the factory O RING-DRAIN CAP used to seal the sump / drain-cap and suction-filter area on Royal Enfield UCE engines.

Part Identification

Short Hook

Stop oil seepage around the UCE drain-cap / suction-filter cover with genuine Royal Enfield 570057/B, the correct factory sealing O-ring for the 570078-series sump drain-cap assembly.

Detailed Product Description

Royal Enfield 570057/B is the genuine O-ring that seals the drain-cap / suction-filter opening in the right-hand crankcase of UCE engines.

Royal Enfield parts books place 570057/B beside the 570054/G Suction Filter Assembly and the 570078/D Sump Drain Cap Assembly. The O-ring prevents engine oil from leaking past the drain-cap sealing surface.

This is a routine service-area sealing component. A flattened, hardened, cut or swollen O-ring can cause persistent oil seepage even when the drain cap itself is correctly tightened.

What This Product Is

• Genuine Royal Enfield OEM O-ring.
• Drain-cap / sump-cap sealing O-ring.
• Used around the UCE suction-filter / drain-cap assembly.
• Oil-resistant engine sealing component.
• Sold individually.

What This Product Is Not

• Not the sump drain cap itself.
• Not the magnetic oil drain plug.
• Not the suction filter assembly.
• Not the copper washer used on a different oil-drain / inspection plug.
• Not the engine oil-filter O-ring kit.
• Not for J-Series 350 engines.
• Not for Himalayan 411 / Scram 411.
• Not for 450 or 650 engines.

Key Features

• Genuine Royal Enfield factory seal.
• Correct fit where 570057/B is specified.
• Seals the sump / suction-filter drain-cap opening.
• Helps prevent engine-oil seepage.
• Recommended for inspection during oil-service work.
• Exact OEM identification prevents use of visually similar but incorrect generic O-rings.

Buyer Search Names / Internal Search Keywords

570057/B, 570057B, 570057, Royal Enfield drain cap O-ring, UCE oil drain O-ring, Classic 350 sump O-ring, Classic 500 drain cap seal, Bullet 350 suction filter O-ring, Bullet 500 drain O-ring, Thunderbird oil drain O-ring, GT535 drain cap O-ring, Royal Enfield oil strainer O-ring.

Confirmed Compatibility

Strongly Supported / Verify Exact EPC Before Dispatch

Not Compatible / Do Not Order For

Part Number / Revision Notes

Current exact part number:

570057/B — O RING-DRAIN CAP

The base number 570057 is commonly used in older diagrams and search results. Current genuine-parts price data carries the /B revision.

Use 570057/B for Shopify Variant SKU, Google Shopping MPN, stock labels and invoices.

Similar Parts Comparison

When Should This Be Replaced?

• O-ring is flattened or permanently compressed.
• Rubber has hardened due to engine heat.
• O-ring is cut, nicked or torn.
• Oil seepage is visible around the drain-cap / suction-filter cover.
• Drain cap has been removed during oil-service work and the seal condition is doubtful.
• O-ring is swollen, distorted or chemically damaged.

Recommended Related Parts to Check

• 570078/D – Sump Drain Cap Assembly.
• 570054/G – Suction Filter Assembly.
• 570276/D – Magnetic Oil Drain Plug Assembly.
• 144846/A – Copper Washer where applicable.
• 888414 – Oil Filter with O-Ring Kit where applicable.
• Correct engine oil for the specific UCE model.

What’s in the Box

1 × Genuine Royal Enfield 570057/B O Ring - Drain Cap

Drain cap, suction filter, magnetic drain plug, copper washer and oil filter are not included unless explicitly stated.

Installation Notes

1. Confirm the crankcase EPC specifies 570057/B.
2. Drain / service engine oil according to the workshop procedure.
3. Remove the sump / suction-filter drain cap carefully.
4. Remove the old O-ring without scratching the sealing groove.
5. Clean the groove and sealing surface.
6. Lightly lubricate the new O-ring with clean engine oil before installation.
7. Ensure the O-ring is not twisted or pinched.
8. Refit the cap and tighten to the model-specific workshop torque.
9. Run the engine and inspect for leakage after service.

Return-Prevention Note / Before You Buy

1. Match exact SKU 570057/B.
2. Confirm your motorcycle uses a UCE / GT535 engine and the 570057 drain-cap O-ring.
3. Do not confuse this with the main oil-filter O-ring.
4. Do not confuse it with the copper drain-plug washer.
5. Do not order for Classic Reborn, Meteor, Hunter or new Bullet J-Series.
6. Do not choose a generic O-ring only by visual size; oil resistance and correct section size matter.

Correctly supplied seals / O-rings are not returnable or exchangeable after installation, oil contact, package opening where the seal cannot be resold hygienically, incorrect model selection, incorrect diagnosis or change of mind. Eligible wrong-item or damaged-item claims require applicable proof and complete unboxing evidence under store policy.

FAQs

What is Royal Enfield 570057/B?
It is the genuine O-ring that seals the UCE drain-cap / suction-filter opening in the right-hand crankcase.

Does it fit Classic 350 UCE?
Yes. Royal Enfield's Retailer Spares Handbook directly lists 570057/B for Classic 350 BSIII, and current UCE references support the broader Classic 350 UCE family.

Does it fit Classic 500?
Yes. Current genuine-parts assignments list Classic 500 Euro 3/4 and related variants.

Does it fit Bullet 500?
Yes. Genuine assignments list Bullet 500 Euro 3/4 and Trials 500.

Does it fit Thunderbird 350 and 500?
Yes. The factory Thunderbird 350/500 catalogue directly lists 570057/B.

Does it fit Continental GT 535?
Yes. Current genuine-parts assignment directly lists GT 535 Euro 3 and Euro 4.

Does it fit Bullet 350 / Electra UCE?
Current genuine specialist references support both. Match the exact crankcase EPC if you need model-year-specific confirmation.

Does it fit Classic 350 Reborn?
No. Reborn uses the J-Series engine.

Is this the oil drain bolt washer?
No. This is a rubber O-ring for the drain-cap / suction-filter assembly, not the copper washer used on a separate plug.

Does quantity 1 mean a pack?
No. Quantity 1 means one O-ring.

SEO Tags

Royal Enfield, Genuine Royal Enfield Parts, 570057/B, 570057B, 570057, O RING-DRAIN CAP, Oil Drain Cap O-Ring, Sump Drain Cap O-Ring, Suction Filter O-Ring, Crankcase Drain O-Ring, Oil Strainer Cap O-Ring, Classic 350 UCE, Classic 500 EFI, Bullet 350 UCE, Bullet 500 UCE, Electra 350 UCE, Thunderbird 350, Thunderbird 500, Thunderbird X 350, Thunderbird X 500, Continental GT 535, UCE Engine, Royal Enfield Oil Service Parts, OEM O-Ring, OEM Spares

Image Filename Suggestions

• royal-enfield-570057-b-o-ring-drain-cap.jpg
• royal-enfield-uce-suction-filter-drain-cap-o-ring-570057-b.jpg
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Image Alt Text

Genuine Royal Enfield 570057/B oil drain cap and suction filter O-ring for UCE Classic, Bullet, Electra, Thunderbird and Continental GT 535

Google Shopping Notes

Competitor Gap Analysis

Most listings only state O RING-DRAIN CAP or broadly claim “all UCE models.” This listing improves buyer clarity by explaining that the seal belongs to the sump / suction-filter drain-cap assembly, distinguishing it from the magnetic drain plug, copper washer and main oil-filter O-ring, separating UCE from J-Series / LS410 / 450 / 650 platforms, and giving direct fitment evidence for Thunderbird 350/500, Classic 500, Bullet 500 and Continental GT 535.