I have used Scubapro Mk 10's, Mk 20's and Mk 25's for the lart 20 years but recently switched to a Mk 17 and prefer it over anything else I have used, especially for extremely cold water diving.
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DA Aquamaster:That pretty much applies to any unbalanaced flow by piston design. The Scubapro MK 2, MK 3, MK 200, Mk 2 Plus, older Aqualung Calypso, etc all fall into that category of having only one moving part, 2 dynamic 0-rings, a seat and a filter to replace at annual service.
I am pretty sure I could train a chimp to do an annual service on one.