Gaskets and Seals› O-rings, Grommets and Vacuum Caps

PAI

EPDM Rubber O-Ring, 0.987-Inch ID

$1,848.62

SKU: 121257

In Stock
In Stock
Ships by Sep 9
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Overview

It is made from EPDM rubber and features an inside diameter of 0.987 inches. This O-ring is an alternative and replacement for Cummins part numbers 3072375 and 3066212.
Show original supplier description
The PAI Industries O-RING,OIL, also known by part number 121257, is a crucial component for oil cooler mounting kits, specifically designed for Cummins engines. This rectangular sealing ring is constructed from durable EPDM rubber, ensuring reliable performance and a secure seal. With an inside diameter of 0.987 inches, this O-ring serves as a direct replacement for OEM part numbers, including the widely recognized Cummins 3072375 and 3066212. Its specifications ensure compatibility and ease of installation for mechanics and DIY enthusiasts alike. The product is often sold in convenient packs, such as a pack of 12, making it suitable for fleet maintenance or workshops that handle multiple Cummins applications. This O-ring is essential for maintaining the integrity of the oil cooling system, preventing leaks and ensuring optimal engine operation. Its robust EPDM rubber construction offers resistance to oil and heat, contributing to its longevity and effectiveness in demanding engine environments.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandPAI
Part Number121257
CategoryGaskets and Seals

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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