RS681 Regulator

The TUSA RS-681 REGULATOR offers superior performance, advanced breathing technology, and a lightweight, compact design. With the ultra-compact R-600 balanced diaphragm first stage and the high-performance S-81 second stage, this system ensures smooth, natural breathing in any diving condition.

Available Variants:

• RS681P (Metric)
• Measurement Units: Bar / °C
• Ideal For: Philippines, Asia, Europe, other metric-based regions
• RS681U (Imperial)
• Measurement Units: PSI / °F
• Ideal For: USA, Canada, and other imperial-based regions

✅ Both versions are identical in design, performance, and features. The only difference lies in the units of measurement displayed on the gauge and/or packaging.

First Stage (R-600)

• Ultra-compact, balanced diaphragm design
• 2 High Pressure (HP) and 4 Low Pressure (LP) ports
• Environmentally sealed – protects from freezing and contamination
• Optional EK-600 Cold Water Kit for diving below 10°C / 50°F
• Optional DIN-R600 Conversion Kit (300 bar / 4350 psi)

Second Stage (S-81)

• Low-profile, elliptical case design
• S.E.A. (Sequential Exhaust Assist) system for smooth exhalation
• Venturi adjustment lever

TECHNOLOGY:

	TEFLON COATED PLATE TEST The Teflon Coated Plate prevents “dry mouth.” Condensation forms on the brass plate adding moisture to the dry air released from scuba cylinders.
	CLICK SPRING ADJUSTMENT The Click Spring Adjustment feature is exclusive to TUSA. It is a five (5)-position adjustment knob designed to better control breathing resistance.
	COLD WATER READY The Cold Water Ready feature enables the diver to use the regulator in water temperatures below 50° F / 10° C.
	ENVIRONMENTALLY SEALED 1ST STAGE The use of a secondary diaphragm and piston sealing the 1st stage preventing contamination or freezing when the regulator is submersed in contaminated or freezing water.
	ORTHO-CONSCIOUS MOUTH PIECE The Ortho-Conscious Mouth Piece feature prevents jaw fatigue. The ridges and flexible material allow the diver to have more control of the mouth piece and reduces tension in the jaw.
	SEQUENCE EXHAUST ASSIST SYSTEM The Sequence Exhaust Assist System gives the diver less resistance when exhaling due to its unique double exhaust design. The diver experiences smooth breathing cycles reducing air consumption and fatigue.
	VENTURI FLOW ADJUSTMENT The Venturi Flow Adjustment allows for ease of breathing by controlling the direction of air through the mouthpiece.