AC Flood Guard GraviTrip, home

Patented gravity-activated shutoff

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Stop A/C water damage before it starts.

When a condensate drain line clogs, the overflow fills the GraviTrip™ collection bottle. The weight of that water trips a factory calibrated switch that shuts the HVAC system off. No float mechanism, just gravity.

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  • 2 issued U.S. patents
  • UL Recognized components
  • 3-year limited switch warranty
AC Flood Guard GraviTrip product box. The lid reads: Stops water damage before it starts.

Professional grade

GraviTrip installed in an air-handler closet, with the switch box on the wall and the collection bottle hanging beside the drain line.
Installed beside the air handler

The problem

A clogged drain line can quietly flood a home.

Air conditioning units remove moisture from the air and direct it through a condensate drain line. When that line clogs, water backs up and can overflow into the home, causing water and mold damage. Traditional float switches are designed to prevent this, but they can fail when the float gets stuck or the electronic components malfunction. Unfortunately, these float switch failures often go undetected until water damage has already occurred.

in water damage claims every year
$13B
in water damage claims come from clogged A/C drain lines
$1.2B
people a day experience a water event at home or work
14,000
average repair cost per flood event, plus an average $2,500 insurance deductible
$10–12K
of homeowners have a professional service their A/C regularly, so many drain lines and float switches go unchecked
42%

Industry reports

How it works

Gravity does the work.

GraviTrip adds a simple, gravity-driven line of defense to the condensate system. It responds to the one thing that matters: water with nowhere else to go.

  1. Overflow fills the bottle

    If the condensate drain line clogs or backs up, overflow water runs through 3/4-inch PVC into the GraviTrip collection bottle.

  2. Water weight trips the switch

    As the bottle reaches its set fill level, the added weight pulls the factory calibrated chain and actuates the weight-activated switch.

  3. The 24 VAC control circuit shuts off the HVAC

    Wired in series on the low-voltage R line, the switch interrupts the control circuit and the system shuts down.

Explore the GraviTrip system
How the GraviTrip shutoff works An air handler with a condensate drain line. Overflow from a clogged drain runs through PVC pipe into a collection bottle that hangs from a chain below a wall-mounted, factory calibrated weight-activated switch. As the bottle fills, its weight pulls the chain and trips the switch, and the 24 volt control circuit turns the HVAC system off. 24 VAC controls COOLING HVAC OFF Drain overflow Factory calibrated weight-activated switch Calibrated chain Collection bottle
Illustration: overflow fills the bottle, the added weight pulls the chain, and the switch turns the HVAC system off.

Why GraviTrip

Engineered for HVAC professionals.

Built to protect what matters, with a gravity-activated design that is simple to install, test and reset.

  • No float mechanism

    A gravity-activated design that responds to the weight of collected water instead of a float rising in a pan.

  • Factory calibrated trip weight

    The switch is calibrated to activate at a specified load that includes the complete factory chain, so it trips at a set fill level.

  • A signal you can see

    If the system shuts off and the translucent bottle holds water, you know why: a drain or overflow condition for a technician to clear.

  • Simple reset

    Once the drain is cleared, empty the bottle, refit it, and gently pull the chain to reset the switch.

  • UL Recognized components

    A UL 61058-rated switch in a UL 94 V-1-rated switch box, with 18 AWG UL 1007-rated wire leads.

  • 3-year limited switch warranty

    Built to perform and backed for the long run, with a three-year limited warranty covering switch failure.

An early AC Flood Guard prototype mounted to an air handler, with a grey bottle hanger, chain and collection bottle connected to the PVC condensate line.
Early prototype, 2023

Our story

Invented by a property manager who kept finding the damage.

“We regularly walk into homes for our weekly inspections and discover water damage from the air-conditioning system.”

Todd Walker, Founder & Inventor

Todd Walker owns a residential property management company in South Florida. Since 2006, his team has managed homes for seasonal residents. AC Flood Guard grew out of what they kept finding on inspections, and out of a simple fact: safety float switches can fail.

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Who it's for

One safeguard, three ways in.

Protect the homes you're responsible for.

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