This manual provides installation guidelines, operating recommendations, and safety information to help you achieve maximum dissolved oxygen and peak performance from your DANNCO Venturi.

Multiple Uses

The DANNCO Venturi is available in multiple sizes and is designed to increase dissolved oxygen (DO) in the water, benefiting virtually anything that swims-including baitfish (fresh and saltwater), livewells, CPR (catch-and-release) systems and DIY tanks.

Dissolved Oxygen

DANNCO Venturis are specifically engineered to raise and maintain dissolved oxygen (DO) to a high, yet safe, level for all baitfish.  Rather an simply creating bubbles, the venturi uses the surrounding atmospheric air that we breathe-containing approximately 20.95% oxygen-and microscopically infuses it into the water. 

Built to Last

DANNCO Venturis are precision manufactured using a high-quality injection molding process and are designed to provide decades of reliable service in both freshwater and saltwater applications.

Like any mechanical component exposed to water or weather, the rubber O-rings are considered normal wear items and may eventually require replacement.

IMPORTANT SAFETY WARNING

NEVER connect compressed oxygen or an oxygen bottle to the venturi air inlet line.

Doing so can create dangerously high dissolved oxygen levels and may present a serious fire or explosion hazard when pressurized oxygen is introduced into an electrical pumping system.

Always operate your DANNCO Venturi exactly as designed, using only fresh atmospheric air.

Air Inlet Routing

For maximum performance, route the air inlet hose to the outside of your bait tank or live well and position it well above the waterline.

This serves two important purposes:

• Allows fresh outside air into the venturi.
• Prevents water from siphoning out of the tank through the airline when the pump is off.

Never allow the end of the air hose to remain below the waterline.

Always make sure that your airline is pulling air from a clean air source.  For example, airline should not be placed in an engine compartment.  This could allow toxic fumes to be injected into your bait water significantly reducing the quality of the water and killing everything in your tank.

Venturi Placement Matters

DANNCO Venturis perform best when installed as close as possible to the point where the water re-enters the bait tank or live well.

Every fitting, valve, elbow, or length of plumbing located after the venturi creates back pressure, reducing its ability to draw air efficiently.  Too much back pressure will result in water coming out the airline.  Additionally, once the venturi breaks the air into micro bubbles, this air will begin to coagulate back into big bubbles unless it's immediately released into the bait tank or live well.  For BEST performance, Install the venturi as close to the discharge outlet as practical.  Minimize elbows, valves, reducers, and unnecessary plumbing after the venturi.  Keep plumbing simple and unrestricted.  Whenever possible, install the venturi discharge through the sidewall of the bait tank or live well and as close to the bottom as possible.

Bigger is not Better

Be sure to match recommended pump size (GPH) to the correct Venturi.  A pump that is too large will create backpressure and water will come out the air line, too small will not draft air into the water.  Each venturi is regulated for different size pumps, both 12v and 110v.

#5 Venturi (Inline or Bulkhead)

This Venturi is regulated for any pump, 12v or 110v between 300-500 GPH.  Anything less than a 300 GPH will not draft air into the water and anything over 500 GPH will create back pressure and cause water to be pushed out the airline.

#8 Venturi (Inline or Bulkhead)

This Venturi is regulated for any pump, 12v or 110v between 500-800 GPH.  Anything less than a 500 GPH will not draft air into the water and anything over 800 GPH will create back pressure and cause water to be pushed out the airline.

#11 Venturi (Bulkhead)

This Venturi is regulated for any pump, 12v or 110v between 800-1100 GPH.  Anything less than a 800 GPH will not draft air into the water and anything over 1100 GPH will create back pressure and cause water to be pushed out the airline.