Hi all, I have a Kellogg-American 15hp air compressor from the late 70's/early 80's. I can't find a diagram for it on the ol' web, and all of my local shops won't service it since it's "too old". so I have been advised to basically run it til it dies, and buy a new one. But it works pretty great, so I want to keep it going as long as I can. I know this is gonna sound like a total doofus question, but I need help finding the oil drain plug, and filler plug(and air filter location, if possible). Please see the attached images; can any of you maybe locate those two? I'm guessing the cylindrical brass piece is the filler plug, and one of the lower plugs is the drain plug. Thanks for the help!