Absolute Wits End makes a cap for the coupler. Its a bit expensive (IMO) for what it is but will certainly help keep the road grime out of there
https://absolute-wits-end.com/arb-fitting-air-coupler-pacifier/
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That is nicer than mine. I cheaped out and just got a spare coupler and packed it full of JB Weld. Works, but not nearly as pretty.
Oh and I forgot to mention that it makes a really nice projectile when pressure is applied and you pull the release.
And no matter what anyone says, I DID NOT PUT THAT DENT IN MY WIFE'S NEW HONDA!!
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