TUSA RS-790 Regulator

Special Price £319.95
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Regular Price £347.00
RRP £347.00
Availability: Ships in 1-2 Days
Free UK Delivery

The TUSA RS-790 Regulator represents the pinnacle of Japanese diving technology. Designed to take on the challenges of even the most hostile diving environments the RS-790 is able to take on waters in temperatures below 10*C with unparalleled performance.

Free UK Delivery

The TUSA RS-790 Regulator represents the pinnacle of Japanese diving technology. Designed to take on the challenges of even the most hostile diving environments the RS-790 is able to take on waters in temperatures below 10*C with unparalleled performance.

TUSA RS-790 Regulator

The TUSA RS-790 Regulator represents the pinnacle of Japanese diving technology. Designed to take on the challenges of even the most hostile diving environments the RS-790 is able to take on waters in temperatures below 10*C with unparalleled performance.

The R-700 first stage features a balanced diaphragm first stage with anti-freeze system for exceptionally easy breathing throughout your dive. A Dry ambient pressure chamber prevents water contacting with the diaphragm improving performance and preventing ice build, even in sub 10*C water. The top cap is ribbed like a radiator increasing its surface area for improved heat transfer allowing the internals of the first stage to retain heat, preventing freezing.

Two high flow ports and two Low pressure ports allow you to install all the gear you need for your dive with 15% increase in air flow.

The pneumatically balanced second stage ensures your breathing is consistent and clean even when the tank begins to empty of air or at extreme depths when breathing often becomes difficult. A robust composite housing not only protects your second stage from damage but insulates it against the cold, preventing ice build-up and warming the air you’re breathing for a more comfortable experience. The Venturi switch on the 2nd stage allows you to control and free flow of air to the mouthpiece ensuring you don’t waste oxygen when you’re at the surface or not wearing the mouthpiece.

Key Benefits

R-700 First Stage


  • Balanced Diaphragm - The R-700 First stage features a balanced designed. Combined the S-90 second stage this provides you with clear, consistent breathing no matter how much air is left in your tank.
  • Capable In sub 10*C - The Dry Ambient chamber prevents water from contacting with the diaphragm. This ensures maximum performance by preventing ice build-up within the regulator making it suitable for the coldest of waters.

  • Ribbed Top Cap - The ribbed top cap functions like a radiator increasing by the surface area of the 1st stage for improved thermals.
  • Tough Construction - Made from marine grade stainless steel and tough composite plastic the R-700 is able to handle anything you throw at it.
  • 2 HP, 2 LP - Two High pressure and two Low Pressure ports deliver up to a 15% increase in air flow and allow you to connect all your gauges and gear.
  • Yoke Or Din Options - The R-700 is available in both Yoke or Din configurations depending on your needs and preference.

S-90 Second Stage


  • Venturi Switch - Easy control or limit the free flow of air going to your mouthpiece with the built in Venturi switch. This ensures you don’t waste oxygen when at the surface or when not using the mouthpiece.
  • Pneumatically-Balanced Second Stage - Breath easy and consistent air throughout your dive in any condition. A small chamber positioned at the end of the poppet assembly traps air and forces the poppet back against the pressure opening.
  • Comfortable Mouthpiece - A mouthpiece supports your jaw for a comfortable fit, ideal for long, enjoyable dives.
  • Lightweight Composite Design - Constructed from durable composite the S-90 is resistant to damage and lightweight. This material provides insulation increasing the air temperature as it enters your mouth for more comfortable breathing in chilly water.

Who is the TUSA RS-790 Regulator For?

The TUSA RS-790 is a do-it-all, take-on-anything regulator. Designed to handle the most hostile dive environments it’ll be suitable for diving anywhere. Be it in frosty UK (or colder!) waters or in more comfortable diving conditions in more temperate waters the RS-790 will give you clear and comfortable breathing.

Like any product from TUSA its made to the uncompromising standards you’d expect from a classic Japanese brand making it just as suitable to recreational divers on all levels as it is for high end commercial diving.

Who are TUSA?

One of the world’s first mask and snorkel manufacturers, Tusa was founded in Japan in 1952 by Kazuo Tabata who built the first mask series by hand in a humble garage. Since those early beginnings, Tusa have always been dedicated to innovating the market.

With Tusa branded dive equipment you know you’re going to get the best quality equipment as it’s manufactured to ISO 9001 Standards. At Deep Blue we are happy to recommend Tusa equipment to anyone looking for high quality dive gear.

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