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Jason

> I would not reccomend anybody to switch gases using a switch block.

Blocks have been in use in the UK for some time now with no problems. It appears
that most of the problems are procedural, not equipment related. A good design
switch block should have the following features:-

Positive lock on the position that allows the diver access to their
decompression Gas(es). This ensures that the switch to deco gas is a conscious
one.

Snap connectors for Decompression gas connections - this allows multi gas
switches and also  gives access to staged gas or gas carried by dive partner(s).

All deco/travel gas cylinders connected to the block must be EITHER left
disconnected until required and disconnected after use, OR
connected,pressurized,tested and then turned of until required and turned off
after use. This makes a wrong switch nearly impossible due to the actions
required during the switch. Most users tend to use the second method described.

Regards

Chris

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