[TerryW]

This would be a good time to switch to electric. It has been done before on classic Newell. That would provide for intermittent wipe as well. Here’s a pic of the replacement part obtained through American Bus for 316.
Dirks and Four State Trucks offer conversion kits.

Holy smokes those are EXPENSIVE. I had no idea. Ok, well I'll try to get the air system working for now and if I hit the Powerball I'll check back in with electric. Whew, I need to get a pacemaker after that sticker shock.