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Barrette's Small Engines Inc. - SmallEngines.ca FAQ's
Why is the water coming out of the little rectangle on my pump?
Most of our units are equipped with a thermal relief valve. This will activate when the trigger on the gun is not being used for 2 to 3 minutes.
This is a safety feature for the pump, so that it does not overheat. If you do not plan to use the pressure washer for a few minutes, shut it down to prevent the thermal relief from actuating.