Filter, reg and oiler all 1/2" fittings all nicely packed in expanded foam. All 3 were assembled but never used. Picked up for under $60.
I have a 3/8" filter/reg. I picked up an oiler off ebay that said it was 3/8". Seller noticed it was 1/4" at last minute but I took it anyway (was under $20.)
This will upsize mine to 1/2". I'll sell the old oiler and move the filter/reg to my air hose reel. That gets rid of a cheap reg that is starting to leak and filter that has to be 30 years old. So upgrade all around.