Tusa RS-790 delivers performance, durability and comfort making it the ideal choice for discerning divers.
The R-700 is a balanced diaphragm first stage designed for cold-water use, it features a dry ambient pressure chamber that prevents water contact with the diaphragm maximizing performance in temperate water conditions below 50°F/10°C. Additionally, the R-700 has an external rib section that nearly doubles the surface area for thermal exchange further reducing ice formaton that can lead to freeze up in extreme conditions. The R-700 has two high pressure ports and four low pressure ports including two high flow (HF) that deliver up to a 15% increase in air flow. It 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 free flow or a dive setting for maximum air flow during the dive.
The RS-790 offers the following features:
R-700 First Stage Dry Ambient Pressure Chamber
The dry ambient pressure chamber on the R-700 prevents water contact with the diaphragm and spring maximizing performance, at any depth, in cold water conditions below 50°F/10°C.
Ideal For Cold Water Environments
The R-700 is engineered for cold water diving. It features a ribbed top cap section that acts like a radiator to increase the surface area for heat transfer. This design allows warming of the critical internal first stage parts that can freeze due to the gas pressure drops and low temperatures.
High Flow Ports
Two high flow low pressure ports are available on the R-700 in addition to two standard LP ports and 2 HP ports. The high flow ports are positioned near the diaphragm and offer up to a 15% increase in air flow.
S-90 Second Stage Pneumatically Balanced System The S-90 second stage is a pneumatically balanced design. A small chamber positioned at the end of the poppet assembly traps air and forces the poppet back against the intermediate pressure orifice. This provides decreased inhalation resistance and increases smooth breathing in all conditions.
Venturi Adjustment Lever
The S-90 is equipped with a built-in Venturi adjustment lever. Two positions are selectable by the diver. Use Surface or the minimum setting when entering the water or on the surface, reducing the sensitivity and possible free flow of the second stage. Use the Dive or maximum setting for maximum air flow during the dive.
[tab name="Features" icon="film"]
First stage (R-700)
Balanced Diaphragm Design
Dry Ambient Pressure Chamber
Ideal for Temperatures Below 50°F (10°C)
Nitrox Compatible to 40%
2 High Flow LP Ports 15% Increase Air Flow
2 Standard LP Ports
2 HP Ports
Pneumatically Balanced Design
Lightweight, Compact Composite Case
Venturi Adjustment Lever
Ortho-Consciously Designed Silicone Mouthpiece
Limited Lifetime Warranty
[tab name="Specs" icon="clipboard"]
ADVANCED FLOW SYSTEM
The Advanced Flow System allows ease of air flow and makes air delivery smoother due to the curved housing structure.
COLD WATER READY
The Cold Water Ready feature enables the diver to use the regulator in water temperatures below 50° F / 10° C.
ENVIRONMENTALLY SEALED 1ST STAGE
The use of a secondary diaphragm and piston sealing the 1st stage preventing contamination or freezing when the regulator is submersed in contaminated or freezing water.
ORTHO-CONSCIOUS MOUTH PIECE
The Ortho-Conscious Mouth Piece feature prevents jaw fatigue. The ridges and flexible material allow the diver to have more control of the mouth piece and reduces tension in the jaw.
PNEUMATICALLY BALANCED 2ND STAGE
A balance chamber added to the regulator 2nd stage, providing equal pressure to both sides of the LP seat greatly reducing inhalation effort.
[tab name="Free Service" icon="clipboard"]
If you buy from Stone Sports, we will service your gear for FREE for 5 years.*