Scubapro S620 Ti Regulator

At a glance

The S620 Ti is a second stage, not a full regulator: 180 g, with a titanium exterior over a fibreglass-reinforced nylon housing. It carries an adjustable inhalation effort knob and a VIV switch that stops surface free-flow. Scubapro designs it around the MK25 EVO balanced piston first stage, and that pairing is where its performance figures come from.

What the regulator actually gives you

Where it wins and where it costs you

Full review: Scubapro S620 Ti Regulator

At 180 g the S620 Ti is a genuinely light second stage, and the weight comes from the material choice: a titanium exterior shell over a fibreglass-reinforced nylon housing. Titanium resists saltwater corrosion better than chrome-plated brass, which is the failure mode that eventually retires most metal second stages. Low mass also reduces jaw fatigue over a long dive, and the low-profile housing keeps the regulator from levering against the mouth when you turn your head.

The valve is pneumatically balanced, so inhalation effort stays consistent from a full cylinder down to reserve rather than tightening as pressure falls. Two controls let you shape that behaviour: an adjustable inhalation effort knob for cracking effort, and the Venturi Initiated Vacuum switch, which suppresses free-flow at the surface and opens the venturi assist when you want maximum flow. A large soft silicone purge cover clears the regulator quickly with gloved hands, and the exhaust valve is sized to keep bubbles away from the mask.

The pairing matters. Scubapro builds the S620 Ti around the MK25 EVO balanced piston first stage, and that combination is what produces the cold-water performance and the effortless deep breathing divers describe. Attach it to a modest first stage and you cap what it can do. The other costs are financial: titanium components raise the price of both purchase and repair, and the regulator wants periodic professional servicing to keep its tuning where it should be.