I have 3 or 4 yellow hoses that I use with my nailers when doing a big job. I have an oiler on those hoses. I have 2 blue hoses I use exclusively in the shop,etc that never had oil in them. If I use a nailer in the shop I put a drop or 2 directly into the nailgun.
Yellow = caution
I have a built-in piping system for my shop air. While making for easy access in many places around my shop and yard, it doesn't allow me to maintain multiple air lines to change out between oil and no-oil applications.
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