Scubapro MK25EVO/S620Ti (SRP: £585)
The S600 was always one of Scubapro’s best-performing second stages, and now it has been reborn as the S620 Ti, which boasts an improved work of breathing in a smaller and lighter package. The second stage also has a corrosion-free titanium barrel inside the tough techno-polymer case, and venturi and cracking resistance controls that have high-grip rubber co-molded into them. For this test it was paired with the proven MK25EVO flow-through piston first stage, which is fully insulated from the environment by the XTIS (Extended Thermal Insulating System) and has numerous design features to aid cold-water performance.
Scubapro regulators have always faired well when put into group tests, and the S620 Ti/MK25EVO combo does not disappoint. The exclusive new mouthpiece is very comfortable, and the breathe is smooth and dry in all positions. The venturi control didn’t make a huge difference, but dial the cracking resistance control right down and you can almost stop the air flow. Good-looking but built to withstand diver abuse, a solid cold-water regulator.