Top Sellers

  • TUSA RS680 Balanced Scuba Diving Adjustable Regulator

click on thumbnail to zoom
Other products by TUSA
SKU: RS-680
Reg. Price: $589.00
Our Price: $559.99
1 units available
on orders of $35.00 or more.
Please review our shipping policies for details and restrictions.


TUSA RS680 Balanced Scuba Diving Adjustable Regulator

The RS-680 is TUSA's latest regulator that delivers superior performance and build quality in a compact lightweight design. The R-600 paired with the newly developed S-80 second stage further pushes the regulator engineering and performance envelope.

The ultra-compact balanced diaphragm R-600 first stage is incredibly small and weighs only 630g. The R-600 is configured with 2 HP and 4 LP ports allowing for versatile hose placement. A DIN conversion kit (DIN-R600) and an environmental kit (EK-600) is also available.

The newly designed S-80 second stage offers the following features:

S.E.A. - Sequential Exhaust Assist
The Sequential Exhaust Assist (S.E.A.) is a revolutionary new 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. By reducing this resistance or increasing exhalation performance, the diver breathes more naturally and comfortably reducing respiration rate and air consumption. Paired with the R-600 first stage, the S-80 offers a seemingly effortless underwater experience regardless of the workload.

Venturi Adjustment
The addition of a venturi adjustment lever on the S-80 allows the regulator to power assist the diver when underwater utilizing the natural venturi effect. The diver can also adjust the lever to prevent free flow such as on a surface swim.

Moisture Exchange Plate
The S-80 second stage incorporates 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 simply adjust the flow of air according to their needs. The easy-adjust multiple click knob allows you to quickly and finely tune resistance.



  • Ultra-compact balanced diaphragm first stage
  • Lightweight R-600 - 630g.
  • Two High Pressure ports and Four Low Pressure ports
  • EK-600 cold water kit available for temperatures below 50°F / 10°C
  • DIN-R600 conversion kit available (300bar / 4350psi)

1ST STAGE Eligible for TUSA CARE Free Parts for Life Program



  • Elliptical low-profile case design
  • S.E.A. – Sequential Exhaust Assist System (Pat p.)
  • Venturi adjustment lever
  • Built-in moisture exchange plate
  • Universal Swivel Joint for maximum comfort
  • Breathing Resistance Adjustment Control
  • Ortho-consciously designed mouthpiece

2ND STAGE Eligible for TUSA CARE Free Parts for Life Program


Be the first to submit a review on this product!
Review and Rate this Item

Other Items In This Category


Question asked
on 8/17/2011
Could you let me know if you have DIN version and EK-600 kit for cold water diving? What would be the total price for RS-680 DIN + EK-600 environmental kit? Just in case: I need a genuine DIN version of 1st stage, not a Yoke + R-600 conversion kit.
Answer by Bill
on 8/17/2011
Hello, TUSA does not make a DIN conversion on that Regulator but they do make the Cold Water Kit and it cost about $50. Sorry about that. Bill
Question asked
on 7/16/2020
Do you have this one in stock? Yoke?
Answer by chris
on 7/16/2020
Hi, Thanks for your question. Yes, we have 1 in stock and it is a yoke. Thanks Divemaster Chris 866-728-2293