Posted 4 years ago
Heavy Bronze. Has scale from 0 at the top to 9 at the bottom of the sight glass. Top unscrews and has a 1/4" npt threaded hole. The sight glass part unscrews from the body Just above the flare. There are three "Over-center type lugs that hold the body to the base. From the gasket and the material thickness it looks like it designed for some pressure. There are no makers marks on it of any kind. It is extremely well made and the tolerances are very close. the bottom does not show any signs of being over a flame. The local salvage yard did a test an determined it is indeed bronze.