Scubapro MK25 EVO

At a glance

Scubapro's MK25 EVO is a balanced piston first stage certified to 200 m and sealed against ice and contamination. At roughly 1090 g in yoke trim it is not a travel regulator, but the over-balanced design raises intermediate pressure slightly as you descend, so airflow gets better where it matters. Fewer moving parts than a diaphragm design means less to service and less to go wrong.

What the regulator actually gives you

Where it wins and where it costs you

Full review: Scubapro MK25 EVO

The MK25 EVO is a balanced piston first stage, and its defining trait is that the design is over-balanced: as ambient pressure rises, intermediate pressure rises slightly with it. In practice, breathing effort does not degrade on a deep or hard-working dive, which is precisely when a regulator's weaknesses normally surface. The large diameter piston bore backs that up with high volume flow. Certification runs to 200 m, well past recreational limits, which is why the platform keeps appearing on technical divers' manifolds.

Environmental sealing is the second half of the argument. The sealed construction keeps water, sand and ice-forming moisture away from the mechanism, which is what allows the MK25 EVO to work in cold-water wrecks, caves and high-altitude lakes without free-flowing. Port arrangement is generous enough that a technical or sidemount rig routes cleanly, with primary, octopus, inflator, drysuit and gauge hoses all finding sensible angles. Scubapro offers both DIN at 300 bar and yoke, so the same first stage travels between fill standards.

The costs are honest ones. At around 1090 g in yoke configuration it is heavier and bulkier than a diaphragm first stage, and it is not the regulator to build a carry-on travel kit around. The sealing kit adds to the price, and the price was already above entry level. Against that, chrome-plated marine-grade brass survives years of salt exposure, the balanced piston design has fewer moving parts to fail, and Scubapro's service network is among the widest in diving. It pairs naturally with the G260, S620 Ti and A700 second stages.