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Beaverdivers sells scubapro mk17-g250v now for less than 400
Dive Rite regs have the best parts for life program in the world. The newest reg they just came out with is reversible, so it can be used as a right hand regulator or left hand regulator. It also has the lowest cracking pressure of any regulator ever. Very cool.
I'm not sure what the actual number is. But you can call John Bernot at Dive Rite and he can tell you all about them. He is very knowledgeable and easy to talk to. And with Dive Rite's unparalleled parts for life program, it really makes this regulator purchase a no brainer.