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About TUSA RS-680 Regulator

The RS-680 Regulator delivers Superior Performance and Quality in a Compact Lightweight Design. The R-600 mated with a newly developed S-80 Second Stage further pushes the engineering and performance envelope. The Ultra-Compact Chromed Marine Brass Balanced Diaphragm R-600 First Stage is Incredibly-Small and Weighs only 22.2 oz (630g). The R-600 is configured with 2 HP and 4 LP Ports. The Balanced Diaphragm, First Stage Regulator is inherently Environmentally Sealed. The benefit of this type of first stage design is that none of the delicate internal parts are exposed to contaminants such as salt, sand, chlorine or pool acids. These environmental contaminants can cause corrosion and mineral deposits to form on the internal mechanism deteriorating regulator performance.

The S-80 Second Stage offers the following features: S.E.A. - Sequential Exhaust Assist

The Sequential Exhaust Assist (S.E.A.) is a Second Stage design featuring a Dual Exhaust System. The S.E.A. System consists of an Enlarged-Primary and an Auxiliary Exhaust. The Auxiliary Exhaust, located on top of the S-80 Elliptical Case, works in union with the Primary to Significantly Decrease Exhalation Resistance. Exhalation Resistance Directly-Affects the Diver's Natural Breathing Cycle, Reducing this Resistance the diver Breathes-More-Naturally and Comfortably Reducing Respiration Rate and Air Consumption.

Venturi Adjustment
The Venturi Adjustment Lever on the S-80 allows the Regulator to Power-Assist the Diver when underwater utilizing the Natural-Venturi Effect. The diver may also Adjust-the-Lever to Prevent Free Flow such as on a Surface Swim.

Moisture Exchange Plate
The Second Stage has a Moisture Exchange Plate that Captures-Condensation produced by Inhalation and Exhalation Efforts. This Condensation Increases the Humidity of the Air Breathed and helps to reduce that "Dry Mouth" sensation often experienced while diving.

Breathing Resistance Adjustment Control
The Breathing Resistance Adjustment Control on the S-80 allows the diver to Adjust the Flow of Air according to their needs. The Easy-Adjust Multiple-Click Knob allows you to Quickly-and-Finely Tune Breathing Resistance. The Ortho-Consciously Mouthpiece further enhances the Comfort of Bite, Fit, and Stability. Even with a Light-Bite, a High Level of Stability is achieved so there is no Fatigue from long periods of usage. The Second Stage Regulator weighs 15.52 (418g) with the Hose. For Optimum Performance and Comfort, a 3/8" Threaded 30" (76 cm) Swivel Hose is fitted between the S-80 Second Stage and the R-600 First Stage. The Swivel-Joint allows Flexibility of the Hose to Eliminate Hose Tension. The S-80 is a Reliable Down-Stream Demand Valve Design. The TUSA RS-680 Regulator comes with and Owner's Manual and is covered by a Limited Lifetime Warranty.

Warranty Information

This product has a limited lifetime warranty.

(800) 482-2282

TUSA RS-680 Regulator Features

  • Superior Performance and Quality
  • 3/8" Threaded 30" (76 cm) 360° Swiveling Hose
  • Total Weight: 38oz (1,058g)
  • Owner's Manual
  • Limited Lifetime Warranty
  • First Stage:
  • TUSA R-600 Regulator:
  • Balanced Diaphragm Design
  • Ultra-Compact and Lightweight
  • Chromed marine brass construction
  • 2 HP and 4 LP ports
  • Environmentally Sealed: Keeps Contaminate Out; Salt, Sand, Chlorine or Pool Acids
  • Less Maintenance
  • Second Stage:
  • TUSA S-80 Regulator
  • Reliable Downstream Demand Valve Design
  • Elliptical Low-Profile Case
  • S.E.A. - Sequential Exhaust Assist technology (Patent Pending)
  • S.E.A.: Dual Exhaust System for Easy Exhalation Effort
  • Venturi Adjustment Lever Reduced Free-Flow
  • Built-In Moisture Exchange Plate, No "Dry Mouth"
  • Breathing Resistance Adjustment Control
  • Ortho-consciously designed mouthpiece

TUSA RS-680 Regulator Specifications

1'St Stage Type
Balanced Diaphragm
Lp Ports
Hp Ports
Adjustable 2'Nd Stage
2'Nd Stage Type
Downstream Demand Valve
First Stage: Chromed Brass
Hose Thread
Hose Length
30" (76 Cm)
Total Weight
38Oz (1,058G)
Weight [with packaging]
2.85 lb
Mfr #

RS-680 Regulator Customer Reviews

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TUSA RS-680 Regulator

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Reviewed by 1 customer

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(2 of 2 customers found this review helpful)


Great Regulator

By Scuba Ivan

from Panama City, Panama

About Me Advanced

Verified Buyer


  • Adjustable
  • Comfortable
  • Effortless Breathing
  • Nitrox Compatible


    Best Uses

      Comments about TUSA RS-680 Regulator:

      Great regulator. Extremely easy to breath, easy to assemble, adjustable. I used it with Nitrox, and worked perfectly.

      • Diving Type:
      • Drift Diving, Night Diving, Open Water Diving
      • Was this a gift?:
      • No

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      Questions & Answers Powered by TurnTo®

      Questions about this item:

      Shopper  can i use it in cold temperatures?
      RICHARD R  I got mine to dive in warmer waters (nothing thicker than a 3mm full suit) because even though it says it is environmentally sealed... I don't really think it is. Probably best to call Tusa and ask if there is a recommended "no colder than" temp for using it. Besides that, the reg is outstanding! Lightweight, and breathes very easy. -Rick
      Shopper  Is this Nitrox compatible???
      Monica s  yes up to 40% out of the box, beyond that you will need to have it O2cleaned.
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