I ran across an interesting article on Vintage Australian Demand Valves starting on page 24:
http://cdn.caymanislands.ky/portals/0/common/assets/JODHc.pdf
http://cdn.caymanislands.ky/portals/0/common/assets/JODHc.pdf
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include