TUSA’s R-700 And S-90 (RS-790)

What is it?

A regulator built for cold-water conditions. The R-700 is a balanced diaphragm first stage that features a dry ambient pressure chamber that prevents water contact with the diaphragm, maximizing performance in temperate water conditions below 50 degrees Fahrenheit (10 degrees Celsius). The R-700 also has an external rib section that nearly doubles the surface area for thermal exchange, further reducing ice formation that can lead to freezeup in extreme conditions. The R-700 has two high-pressure ports and four low-pressure ports, and is available in both INT (yoke) and DIN versions.

The S-90 second stage is a compact pneumatically balanced system that features a composite housing, which insulates and protects under extreme cold-water conditions. The S-90 is equipped with a built-in Venturi adjustment lever, allowing the diver to select a surface or minimum setting, reducing possible freeflow, or a dive setting for maximum air flow during the dive.