Switchable / Variable water pump: All you need to know

A variable water pump is a mechanical water pumps that allow the impeller to move or not the coolant through the cooling circuit.

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【Powerful Water Removal Pump】High performance PSC motor with thermal overload protection produces great 1.5HP output power for increased reliability

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Smartbot Submersible water pump Flow Rate 3000 GPH, Max Lift 25 Ft, 1/2 HP, 2 Hose Kit, Small Portable Electric Utility Pump, Hand Manual switch (Yellow) Plug-and-Play to work - Yahoo Shopping

Circulator Basics - Answers To The Most Common Questions