You cannot breathe directly out of a scuba tank because of the high pressure. A regulator reduces pressure to safe a level that can be inhaled by the diver. A diving regulator has two parts: the First Stage reduces the tank pressure and connects it to the Second Stage which contains the mouthpiece for breathing

Tusa RS-790


Out of Stock

The 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 formation 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.

Balanced diaphragm first stage with anti-freeze system
Dry ambient pressure chamber ideal for temperatures below 50°F/10°C
Ribbed section to increase heat transfer and resist freezing
Two H.P. ports and Four L.P. (2 standard/2 high flow) ports
High flow L.P. ports offer up to 15% increase in air flow
DIN version available as RS-790 DIN (300bar/4350psi)
Eligible for TUSA CARE Free Parts for Life Program - USA Only
Lightweight, compact composite case design
Pneumatically balanced system
Venturi adjustment lever
Ortho-consciously designed mouthpiece
Eligible for TUSA CARE Free Parts for Life Program - USA Only

Questions (0)

No customer questions submitted.

Only registered user can ask a question. Login

Amazon Product Reviews:

30 other products in the same category:

Compare Icon


Example: Comfortable, Reliable, Good Quality

Report an issue

Please tell us about the issue: