Den replied:

Ray, good to see people using (in house compressors) mine gets used mostly for other people...But Ray the cheap part about a water separator will only let you down when you least require letting down. My compressor is in the engine bay, but is inside an old toolbox with insulation on the (outside) the expansion tank (reservoir) is a couple of short lengths of 50mm vinidex tubing wrapped around just under the tray where its virtually impossable to get hit with rocks. Personally i dont bother with a separator, but you may want to mount it fairly high on the firewall or even inside the cabin for safety, the glass/plastic type bowl sometimes crack and leak on the one i have at home on my 240v compressor. Personally i think you may be just adding something that will probably let you down, like i said, mine usually gets used for other people and not really on my own vehicle..Good luck ..Den