On taking a BSAC O2 course some two years ago we used the manta valves for demand O2 supply. The purge valves were functional as normal, however when I took a DAn O2 course last year with ACUC/NAUI, we used the 'normal' hosptal type purge valve. Just who supplied the UK O2 kits I can not confirm but I think my own clubs one is from SOS and uses the manta type valve.
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