These are the singlehose regs that I found until now:

Avalon (V 121)
Avalon III
Conqueror (V 88)
Conqueror II
Dolphin
Dolphin II
Explorer
Explorer II (VR 4)
Little Gem
Little Gem III
MR 12
MR 12 II
Polaris II (R 14)
Titan (V 111)
Titan II
Titan II J
Viking I
Viking 40 (V11)
40 Fathom (VCR 1)