Cummins - O-Ring Seal - 4019975
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You have 30 days to request a return. All sale items are final sale.
The Cummins 4019975 O Ring Seal is a genuine OEM Cummins sealing component used primarily on Tier 3 5.9 liter ISB/QSB engines. It is a factory replacement O-ring for the correct Cummins assembly location and helps seal the related joint against leakage after service or reassembly.
Key Features
- Genuine Cummins OEM O-ring seal
- Part number: 4019975
- Primary application: Tier 3 5.9L ISB/QSB engines
- Factory replacement sealing component
- Used where Cummins specifies O Ring Seal 4019975
- Recommended replacement whenever the related component is removed
Engine Compatibility
Used primarily on Cummins Tier 3 5.9 liter ISB/QSB diesel engines. Confirm fitment by engine serial number, CPL, and parts diagram location.
Serial Number Fitment Notice
Cummins O-ring seals can vary by engine arrangement, emissions tier, component location, material, and cross-section. Verify against the engine serial number before ordering.
When This Part Needs Replacement
Replace this O-ring if it is flattened, cut, swollen, brittle, cracked, leaking, or disturbed during component removal. Reusing an old O-ring can cause repeat seepage.
Installation Notes
Clean the groove and mating surface before installation. Lightly lubricate the seal with the correct service fluid where required, seat it evenly, and avoid twisting or pinching during assembly.
Alternate/Superseded Part Numbers
- 4019975
Parts Desk Insight
The useful fitment detail for 4019975 is the Tier 3 5.9L ISB/QSB application. Customers should still confirm by serial number because Cummins sealing parts can change by engine arrangement and diagram location.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.