Menu
Search
888.687.0539

Our office will be closed 9/7/2026 in observance of Labor Day. Orders placed during this time will be processed when our office opens 9/8/2026.

Our office will be closed 9/7/2026 in observance of Labor Day. Orders placed during this time will be processed when our office opens 9/8/2026.

Search by Part Number Close
Shopping cart Close

You have no items in your shopping cart.

Menu Close
Picture of 3963988

Cummins 3963988 Sealing Washer

Compatible With 4BT3.9, 6BT5.9, ISB3.9, ISB4.5, QSB3.9, and QSB4.5 Engines

Genuine Cummins Part

$7.65
Not Returnable

PRODUCT NOTES

This is a genuine Cummins Sealing Washer for 4BT3.9, 6BT5.9, ISB3.9, ISB4.5, QSB3.9 and QSB4.5 engines. This is a genuine Cummins part shipped with a 12-month warranty.

Related products

DS-3963988
Hassle-Free Return Item

SEAL

$2.61

3945707

TUBE,FUEL DRAIN

Genuine Cummins Part

$81.31

888.687.0539 (U.S.)|225.706.4858 (Int.)

Monday-Friday 7am-5pm CST
8784 S. Choctaw Dr. Baton Rouge, LA 70815
company information
Resources
Returns

Payment options

Complete your payment with a Visa card Complete your payment with a Master card Complete your payment with an American Express card Complete your payment using PayPal
Diesel Parts Direct BBB Business Review

Caterpillar® and all of the Caterpillar® engine models listed on this website are registered trademarks of Caterpillar, Inc. Cummins® and all of the Cummins® engine models listed on this website are registered trademarks of Cummins. Detroit Diesel® and all of the Detroit Diesel® engine models listed on this website are registered trademarks of Daimler AG. John Deere® and all of the John Deere® engine models listed on this website are registered trademarks of John Deere. Allison Transmission® and all of their transmission models listed on this website are registered trademarks of Allison Transmission®. Diesel Parts Direct is not an authorized dealer for Caterpillar, Cummins, Detroit Diesel, John Deere, or Allison Transmission. None of the parts beginning with "DS" or "R" are genuine Caterpillar, Cummins, Detroit Diesel, John Deere, or Allison Transmission items.

Copyright © 2026 Diesel Parts Direct. All rights reserved.
CID: 2