Drager Piston vs Diaphram 1st stage

DRW1001 · 6th November 2007, 22:18

Anyone know when Drager switched form the older piston style to the diaphragm style first stage?

Is there and advantage from one to another?

Thanks all!

**Freef** · 7th November 2007, 21:35

The older design may be the one with the odd size threads for the LP ports that prevents the use of a non-Drager hose.

My [3 years old] Dolphin has ports that are the same size as a normal reg.

On the Dolphin the first stages are sealed as they don't pressure compensate anyway, so I imagine there is no practical difference.

6th November 2007, 22:18	#1 (permalink)
DRW1001 New Member Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Oct 2007 Location: NY Posts: 25	Drager Piston vs Diaphram 1st stage Anyone know when Drager switched form the older piston style to the diaphragm style first stage? Is there and advantage from one to another? Thanks all!
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7th November 2007, 21:35	#2 (permalink)
Freef Custom Title Disallowed! Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: Land of the Freef, UK. Posts: 1,356	Re: Drager Piston vs Diaphram 1st stage The older design may be the one with the odd size threads for the LP ports that prevents the use of a non-Drager hose. My [3 years old] Dolphin has ports that are the same size as a normal reg. On the Dolphin the first stages are sealed as they don't pressure compensate anyway, so I imagine there is no practical difference. __________________ David. Currently owner of two differently sized ankles.
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