Aqualarm Water Flow Alarm for Wet Exhausts


The Aqualarm Cooling Water Flow Detector is unique in the marine industry, developed and patented specifically for marine engines.

It activates an immediate alarm upon loss of raw water. Comes with Panel and Buzzer

This helps prevent your engine or generator from overheating.  These units must be mounted horizontally (so the water flow is horizontal while going through the unit.

We are New Zealands only official Aqualarm stockist - If there is an aqualarm product that you can not find on our website, please be in touch with us and we will be more than happy to accommodate your request.

Each size, is suited to the hose diameter of your pump on the motor,  so if your pump has a 1"(25mm) internal diameter hose on it then you will select the 1" unit.  Occasionally people put larger hoses than what the initial pump is, (say 1 1/4"- 32mm) going through to their skin fitting. However you must put a water flow detector that suits  the engine pump size (in this case 1"- 25mm)

Sizes suit :

12-18mm - (this size is considered low flow) (1/2 -3/4" internal diameter hose)

25-32mm - (1" - 1 1/4" internal diameter hose)

38mm      - ( 1 1/2" internal diameter hose)

50mm      - ( 2" internal diameter hose)


All units have NPT threads. (USA thread)  so the corresponding NPT thread hose tails must be used (search on aqualarm hose tails on this website).  If you use BSP (NZ) threaded tails they are not close enough and will split the unit. We have NPT (USA) threaded tails here in stock to suit.

If you require 24v, a 24v panel is available at additional cost.