Doff and don vintage rig

[herman]

Nemrod, Captain:

Unfortunately, I can't tell you for certain what specific make of 72's (nor even what type of metal DH's) we used during my long-ago experiences I recounted above--though I'm almost certain they were PST cylinders. I'm wondering, though, if the fact that the divers were actually breathing on the DH regulators at the time (you know, so one or both hoses were filled with air at the time) played a role?

Safe Diving,

rx7diver

Absolutely, the air in the cans and hoses of the DH add a good bit of bouyancy and even the reg itself makes a good bit of difference. The reg Rob was using (I think it's a Faux 50 Fathom but a real one is the same) is a good bit less negative than a DA or RAM, so much so I can tell the difference when I switch between the 2 on the same tank.