Neptune smiled on me at the beginning of 2019... I discovered a 1954 Porpoise CA-1 in original box, complete with twin tank adaptor!
It is in pretty good condition, quite rare to find in Australia these days... so I'm now having fun trying to source NOS or reproduction parts to restore it back to working condition. The diaphragm had dissolved into goo and attached itself to the inside of the cover plate... but all the other parts are intact.
I already have a copy of the Historical Diving Society's excellent book detailing Ted Eldred's work developing the Porpoise line of regulators... the world's first commercially available single hose regulator!
When La Spirotechnique and Aqua-Lung were only producing twin hose scuba and had never dreamed of a single hose system, along came an Australian who changed scuba diving forever. This is the complete story of the engineering brilliance of Australia’s Ted Eldred and the development of his Porpoise scuba, which set today’s world-wide diving standard. Acknowledged by many including HDS US and HDS Australia-Pacific, as the first to mass produce the single hose, 2 stage scuba system as used by scuba divers today.
I also picked up a vintage twin tank set up, which used ex-WWII aircraft oxygen bottles connected by an unusual flat-ended manifold, with what seems to be a bull-nosed gas type outlet. Major diameter appears to be OD 22.4mm x 14 tpi so possibly 5/8" BSP?
Does anyone know the correct thread type, or where to get an adaptor?