Will this oxygen two-stage regulator fit on the shorter and next size down smaller O2 bottle for gas welding?? My set has the smaller floor size bottles that are about half the size of the regular full size floor bottles that fit into the full size two wheeled cart. My bottles are the next size down from the regular taller bottles and the two wheeled cart is a little smaller cart. Not the really small portable bottles that would set on your bench. Mine are the very next size down from the regular size taller bottles is all. The threads on my bottles should be the same as the threads on the taller full size bottles right?? Please let me know and this regulator is a two- stage regulator too, right?? Thank You, Rich Schor at my email site which is rickardoschore@yahoo.com.