On World Plumbing Day, an annual international event that celebrates the important role plumbing plays in the health and safety of modern society, the Canadian Institute of Plumbing & Heating ...Read More
An interesting approach to one-pipe-steam piping, including an air vent
that looks very much like what would become the In-Air-Rid vent. Thanks
to Gerry Gill for finding, scanning and sharing this with us.