PAI Industries, Inc. O-RING Part No: 121436

$15.51

The PAI 121436 O-Ring is a Viton sealing ring designed for heavy-duty diesel applications including Cummins L10, M11, ISM EGR systems. It features a cross-section of 0.21 in and an internal diameter of 1.1 in, with dash number –320. Built to OEM standard (replaces Cummins 3033915), it ensures reliable sealing and durability. Offered by Wofford Truck Parts, this part is backed by PAI’s quality guarantee.

Specifications

The PAI 121436 / 121-436 O-Ring is a robust sealing component designed specifically for heavy-duty engine and EGR system use. It is manufactured from Viton 90 material, making it resistant to high temperatures, chemical exposure, and long service life. The cross section dimension is 0.21 in (5.33 mm), and the internal diameter is 1.1 in (27.94 mm), conforming to dash size –320.

This O-Ring is a direct replacement for Cummins 3033915 and is cross-referenced to Caterpillar 2937589 / 293-7589, as well as the standard AS568A-320 sizing.

In practice, 121436 is commonly used in Cummins L10, M11, ISM, and ISL engine families for EGR, mounting, and sealing locations. (See Sadler listing for L10/M11/ISM EGR O-Ring usage.)

Because it is a simple sealing ring, its compatible “truck models” depend entirely on which trucks used those Cummins engines. It’s recommended to verify the engine family, location, and dash size before installation to ensure proper fit and compatibility.

Weight

0.02