On most pressure washers, when the operator stops pulling the trigger on the gun, the unloader diverts the flow of water back to the pump. The water in this bypass loop can heat up quickly and could damage your pump in as little as 5 minutes (sometimes sooner depending on the configuration of the system). Hydro Tek offers Bypass Cool™ Pump Protection as a standard feature on HD Series belt drive pressure washers and all HN Series pressure washers to protect and extend the life of your pump. This Bypass Cool System sends the water to the float tank of your pressure washer enabling it to act as a radiator when the trigger is not being pulled. This allows the machine to be in bypass much longer without causing damage to the pump. A Bypass System is also available as an option on any hot or cold water pressure washer mounted onto a Hydro Tek tank skid or trailer. This is a factory installed option (order part# APS50) which will bypass the water back to the water supply tank.