ATRO MS99-62620 Polyurethane APU Mount Kit for Thermo King Tri-Pac

Product Overview

Keep your Auxiliary Power Unit (APU) running smoothly and eliminate severe frame vibration with the premium ATRO MS99-62620 Polyurethane APU Mount Kit. Engineered and manufactured in the United States, this complete isolation kit is specifically designed to handle the heavy, constant vibration cycles of compact diesel APU engines—most notably the Thermo King Tri-Pac APU system.

Standard factory rubber mounts quickly soften, sag, and rot when exposed to leaked diesel fuel, engine oil, road grime, and constant climate changes. ATRO’s custom-formulated polyurethane blend is completely impervious to under-cab chemical exposure and will not compress or take a permanent set over time. This ensures your auxiliary power system stays securely aligned and properly isolated, protecting both your APU framework and your truck’s cab comfort.

Complete Station Kit: Each part number ordered comes as a pre-packaged pair containing (1) Upper Mount and (1) Lower Mount to completely refresh a single mounting point.

Specifications & Dimensions

• Shipping Weight: 0.24 lbs

• UPC Code: 751354028799

• Kit Components Included: (1) Upper Mount, (1) Lower Mount

• Outside Diameter (OD) — Large: 1 7/8"

• Outside Diameter (OD) — Small: 1 9/32"

• Hardware Sizing: Fits 1/2" Bolt Size

• Sleeve Dimension: 2"

• Material: Premium Heavy-Duty Polyurethane

• Quantity Per Vehicle: 2 kits required

• Country of Origin: United States

Vehicle & Equipment Application Notes

This poly unit provides a direct heavy-duty upgrade path for both dedicated auxiliary systems and primary truck chassis footprints:

• Thermo King Tri-Pac APU: The premier vibration isolation upgrade for Tri-Pac auxiliary power units.

• Western Star & Freightliner Chassis: Also serves as a high-durability hood mounting station alternative on select class-8 models.

Cross-Reference Guide

This kit serves as an exact cross-reference or direct performance upgrade to the following manufacturer and aftermarket part numbers: