Gladhand seals are easy to replace even when you’re out on the road.
When to Replace Gladhand Seals
As a rule, you should replace Gladhand Seals every year. But if you see signs of damage or wear beforehand, replace them immediately.
3 Steps for Replacing Seals

Gladhand seals prevent air from escaping airlines. Seals are sometimes colored blue or red to match service, or emergency gladhands, while silver/black are universally used.
Tools needed:
- Screwdriver
- A new set of seals
Step #1: Remove the Old Seal: Insert your screwdriver behind the old seal and pop it out.
Step #2: Clean Gladhand: Once the old seal is removed, clean the gladhand cavity with a rag until it’s free of debris and oil.
Step #3: Insert New Seal:
- Insert the new seal and, using your fingers, press around the seal’s surface until its grooves lock into the grooves of the gladhand.
- Once the seal is properly seated, reattach the couple and turn the pressure on to check for leaks.
Utility Keystone sells Phillips brand Gladhand Seals in Blue #12-0161, Red #12-0162, and Black #12-012
And that’s how to replace a mud flap on a semi-trailer. It’s just that easy!

I’m Larry Anders.
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