HOSE & FITTINGS

Hose Fittings For Peterbilt Trucks

Hose fittings connect flexible hose assemblies to rigid lines, components, and bulkhead connections throughout a Peterbilt's cooling, fuel, air, and hydraulic systems. A proper fitting — correct thread type, correct size, and the right sealing method — is what separates a lasting repair from a repeat leak. We carry barbed fittings, push-to-connect fittings, compression fittings, and JIC/NPT adapters for Peterbilt truck hose and line applications.

Frequently asked questions about hose fittings

What's the difference between NPT and JIC fittings on a truck?

NPT (National Pipe Taper) fittings seal on the thread taper itself and typically use thread sealant or PTFE tape to achieve a leak-free connection — they're common in low-pressure air and coolant applications. JIC (Joint Industry Council) 37-degree flare fittings seal on a metal-to-metal flare seat and don't require sealant — they're used in fuel and hydraulic applications where a more reliable, repositionable seal is needed. Using NPT sealant on a JIC fitting or vice versa is a common installation mistake that causes leaks.

How do I know what size hose fitting I need for a Peterbilt repair?

Hose fittings are sized by both the hose inner diameter they accept and the thread or port size they connect to. For a field repair, measure the hose ID and the thread diameter and pitch of the mating port — a thread pitch gauge and calipers are the right tools for the job. Bringing the old fitting to a parts counter for direct comparison is the fastest way to confirm a match when you're unsure of the spec.

Can I reuse hose fittings when replacing a hose?

Reusability depends on the fitting type. Reusable push-on and screw-type hose end fittings can often be transferred to new hose if the fitting body is undamaged and the threads are clean. Crimp-style fittings are not field-reusable — the crimp deforms the ferrule permanently and a new crimp fitting is required for each hose assembly. Never reuse a fitting that shows corrosion, thread damage, or deformation at the hose barb or sealing surface.

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Shop hoses & hardlines for Peterbilt trucks