Quote: (Originally Posted by
Dave Sutton)

YES, Switch blocks are generally not needed. No argument. I've been able to rig my system to work without them. I play with them and I gently caress them at the dive shows (cannot resist nicely made chrome plated brass hardware), but... I don't own one. Come to think of it, I don't know anyone else who does either.
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I'm confused, Dave. In the thread you started
http://www.rebreatherworld.com/revo-...nice-pair.html
there is a picture you posted.
Isn't that a switching block?