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Caterpillar · Models: 3406E / C15 / C16 / C18
321318 Caterpillar 3406E / C15 / C16 O-Ring
Commercial diesel seal & o-ring. Match the listed part and engine identifiers before ordering.
2-Year WarrantyPAI Industries
$33.20$36.38
Save $3.18
In stock — ships same day
18 available
PAI Part #321318
JAK'S Part #JAKS-321318
Kit Membership
Used In These Kits
This part is included in 1 engine & overhaul kits — find yours below.
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360461CAT 3406E C15 C16 C18 Remanufactured Cylinder Head Kit In stock - No kits match that search.
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Suggested Additional Parts
Commonly sold with this product. These parts are sold separately.
| Brand | PAI Industries |
| Part Category | Seals & O-Rings |
| Sub-Type | O-Ring |
| Engine Make | Caterpillar |
| Engine Model | 3406E · C15 · C16 · C18 |
| Condition | New |
| Stage / Tier | Standard |
Discovery models are listed below. Confirm the complete application and any ESN/CPL or size restrictions before ordering.
Caterpillar 3406E C15 C16 C18
Most PAI parts carry a 2-year unlimited-mileage PAI warranty — 3 years on the High Performance tier, 1 year on Excel by PAI. See Warranty & Returns for full coverage terms, or call a specialist to confirm the exact coverage on this part.
PAI published warranty tiers: High Performance — 3-Year · Genuine PAI — 2-Year · Excel — 1-Year, unlimited mileage. The badge beside the price shows this product's recorded term; when no badge is shown, confirm coverage with a specialist.