thenephilm
+1y
I'm looking to run steel hardline for my airline and not stainless because I'm going to have it powdercoated. I've seen discussions on using brake line for air line (since I'm only using 3/ but I wasn't too sure about this idea although it apparently has worked for others. I was wondering about your opinion on this and if you disagree with using it, then what size line would you recommend and what fittings to use? It has been mentioned that one could run regular compression fittings or PTC fittings but once again, I'm not so sure about this just because none of this has been confirmed by truly reliable sources...thoughts?