Hi everybody.
I don't dive rebreathers anymore but did train on a military semiclosed apparatus (death trap - bigger threat than the enemy) in the 1970's so still have an interest and now I have found this forum & hope to keep an eye on it.
Mainly joined to give a bit of a plug for
GO DIVE - SCUBA STORE, DERBY, UK for UK KISS divers who are looking for 3 litre dumpy Heiser cylinders which I saw on one of the threads described as like Rocking Horse poo. They also have a good deal on sofnolime.