Caterpillar Viton O-Ring, PAI 321375 (OEM 3P0647), Pack of 4
Used In These Kits
This part is included in 12 engine & overhaul kits — find yours below.
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321475Caterpillar C7 Injector O-Ring Kit, PAI (OEM 4566994), Pack of 1 In stock -
331511Cat / Caterpillar FRONT GASKET KIT In stock -
331519Cat / Caterpillar C12 ENGINES LOWER GASKET SET In stock -
331557Cat / Caterpillar C11 SERIES LOWER GASKET SET In stock -
331561Cat / Caterpillar 3176 SERIES UPPER GASKET KIT In stock -
331624Gasket and Seal Kit In stock -
331626Caterpillar 3176 / 3176C Fuel Gasket Kit In stock -
331634Cat / Caterpillar C9 ENGINES FRONT STRUCTURE GASKET KIT In stock -
331679Cat / Caterpillar C7 ENGINE FRONT COVER GASKET KIT In stock - No kits match that search.
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 |
| Condition | New |
| Stage / Tier | Standard |
Pack of 4.
PAI 321375 is a Viton o-ring; PAI specifies a 0.549-inch inside diameter and 0.103-inch cross section. The manufacturer-designated reference is Caterpillar OEM 3P0647.
PAI lists these manufacturer references: Caterpillar 081-3665; Caterpillar 0813665; Caterpillar 228-4947; Caterpillar 2284947; Caterpillar 274-1639; Caterpillar 2U0722; Caterpillar 3P0647; Caterpillar 2741639; Cummins 3072397; Cummins 3201125; Detroit Diesel A1408320699.
Compare the complete part number and required specification before ordering.
PAI Part #: 321375
OEM References:
- CATERPILLAR 081-3665
- CATERPILLAR 0813665
- CATERPILLAR 228-4947
- CATERPILLAR 2284947
- CATERPILLAR 274-1639
- CATERPILLAR 2U0722
- CATERPILLAR 3P0647
- CUMMINS 3072397
- CUMMINS 3201125
- CATERPILLAR 2741639
- DETROIT DIESEL A1408320699
Warranty: 2.0 year(s)
These catalog references may identify this part or components in an assembly. A listed number alone does not confirm whole-assembly interchange or vehicle fitment. Confirm the required part before ordering.
| Number |
|---|
| 081-3665 |
| 0813665 |
| 228-4947 |
| 2284947 |
| 274-1639 |
| 2U0722 |
| 3P0647 |
| 3072397 |
| 3201125 |
| 2741639 |
| A1408320699 |
| CATERPILLAR 081-3665 |
| CATERPILLAR 0813665 |
| CATERPILLAR 228-4947 |
| CATERPILLAR 2284947 |
| CATERPILLAR 274-1639 |
| CATERPILLAR 2U0722 |
| CATERPILLAR 3P0647 |
| CUMMINS 3072397 |
| CUMMINS 3201125 |
| CATERPILLAR 2741639 |
| DETROIT DIESEL A1408320699 |
| PAI 321375 |
No cross-reference numbers match that search.
Discovery models are listed below. Confirm the complete application and any ESN/CPL or size restrictions before ordering.
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.