Originally Posted by pepi
Sure I would think you could go to the next size just fine, would not suggest a bolt it might go to deep and interfere with something. You would be better off using a pipe plug. It just needs to be snugged enough to prevent an oil leak the next time you try, I say that cause you will not get to many chances to keep bumping up the size of the drain...
I found an 1/8" pipe tube and a cap to fit over it. If i use just a plug without an extension tube, because of the design, the oil would run all over the top of the compressor. I think they added the short tube as an after thought.
Anyway, I hope the tube with the cap will work, it is pipe threads.