Features 1、The silent 370 water pump is suitable for installation on remote control boats that require water cooling with water‑cooled motors and do not have water‑absorbing rudders. 2、Under the condition of 5V voltage, the water pump still works normally without interruption after 15 hours operation. It's hot but it's in the normal range, which has no impact on future operation. 3、The 370 water pump for water-cooled motor and ESC with a buck module, which has a wider range of use. 4、Since the voltage of the water pump is 3-6V, if your power supply method is not receiver power, and the battery used is greater than 2S, that is, 2S, 3S, 4S, 5S, 6S batteries, the voltage is between 7-28V, You need to use the buck module to reduce the pressure value to 5V before using the water pump. 5、Add a switch between the pump and power supply. When you need pump to work, turn on the switch. When the you need pump to stop working, turn off the switch. Item Type: RC Boat 370 Water Cooling Pump Material: Aluminum Alloy + Plastic Product Color: As Pictures Shown Pump Length: Approx. 73mm / 2.9in (including 7.8mm / 0.3in length of water inlet/outlet) Outer Diameter of Water Inlet/Outlet: Approx. 3.95mm / 0.2in Motor Outer Diameter: Approx. 24.4mm / 1.0in Outer Diameter of Pump Head: Approx. 28mm / 1.1in Product Weight: Approx. 77g / 2.7oz Test Data: Application: For RC Boat, etc,. Package List 1 x RC Boat Water Pump