See the post on MK2 regs here
Find the lowest price for the Scubapro MK2+ R190 Regulator, octopus and packages plus read reviews and see demo video. The MK25 first stage gives a machined, marine-grade chrome plated body and balanced composite/stainless steel piston that would make any diver proud. It demonstrates SCUBAPRO’s dedication to quality and making positive diving experiences. This 1st stage adapts to external pressure alterations and comes regular with the Thermal Insulating Method (TIS), which keeps your 1st stage from freezing up and malfunctioning in cold water conditions. Read reviews and check out the video below.
The New MK25 S600 Regulator from Scubapro has been updated with polished chrome for the first stage and capabilities a new front cover with metal plate and ring and round purge button on the second stage.