International 9900/i/ix Deck Plates-Air Line Box

Frequently Asked Questions About International 9900/i/ix Deck Plates-Air Line Box

What is the purpose of a deck plate and air line box on my International 9900/i/ix?

The deck plate is the flat mounting surface located behind the cab on your International 9900/i/ix, and the air line box is the compartment built into or mounted on that deck plate that houses and protects the air and electrical lines running between the tractor and trailer. Together they provide a clean, organized mounting point for glad hands, electrical connectors, and hoses while shielding the lines from road debris and weather.

Will this deck plate and air line box fit my specific truck without modification?

Deck plates and air line boxes are typically designed to match the frame width and mounting pattern used on the 9900, 9900i, and 9900ix models, but exact fitment can vary depending on the model year and any factory or aftermarket modifications already made to your truck. We recommend comparing the dimensions and mounting hole pattern of the listed part to your existing deck plate before ordering, and reaching out to our team if you are unsure.

What material and finish options are available, and how do they hold up over time?

These parts are commonly available in steel and aluminum, with finishes ranging from raw or painted steel to polished or brushed aluminum. Steel tends to offer more rigidity and a lower upfront cost, while aluminum resists corrosion better and offers a lighter weight with a brighter appearance. Regardless of material, keeping the surface clean and free of trapped moisture will help extend the life of the finish.

How difficult is it to install a replacement deck plate or air line box?

Installation generally involves removing the old deck plate or air line box from the frame, disconnecting the air lines and electrical connectors, and transferring or re-securing the lines to the new unit using the existing mounting holes. Most installations can be done with basic hand tools, but because the air lines and electrical connections are involved, it is important to work carefully to avoid damaging hoses or wiring during the swap.

Can I replace just the air line box, or do I need to replace the entire deck plate assembly?

This depends on how the specific part is constructed and how it was originally installed on your truck. Some air line boxes are separate components that bolt onto the deck plate and can be replaced individually, while others are integrated into the deck plate as a single unit. Check the product details for the item you are considering, and inspect your current setup to confirm whether you need a standalone air line box or a complete deck plate assembly.