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Tusa RS-681 Regulator - First and Second Stage Set

$999.00 Sale:$849.15


The Tusa RS-680 Regulator Set delivers superior performance and quality in a compact lightweight design.

The Tusa R-600 First Stage Regulator mated with a newly developed S-81 Second Stage Regulator 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 630g (22.2 oz). 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 Tusa S-81 Second Stage Regulator 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-81 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-81 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-81 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 418g (15.52 oz) with the hose. For optimum performance and comfort, a 3/8" threaded 75 cm (30") Hose is fitted between the S-80 Second Stage and the R-600 First Stage. 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.

Key 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-81 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:

1st Stage Type: Balanced Diaphram
LP Ports: 4
HP Ports: 2
Adjustable 2nd Stage: Yes
2nd Stage Type: Downstream Demand Valve
Materials: First Stage: Chromed Brass
Hose Thread: 3/8"
Hose Length: 75 cm (30")
Total Weight: 1,058g (38 oz)

Drop Ship
This is not a regularly stocked item in our Rye dive shop. It will be ordered for you from the manufacturer upon request and typically shipped direct from them to you the same day thus resulting in no delay in delivery.

(05/16 LRB)

The Scuba Doctor Australia
Boon Wurrung Country
1/49 Peninsula Ave
Rye Victoria 3941, Australia
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P +613 5985 1700
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