Feature: 1. JST Plug: One of the lines of the 370 motor self priming pump is a JST plug, which can be directly powered (5V‑7.4V) and directly plugged into the receiver tee. 2. Long Term Durability: Under 5V voltage, the 370 RC water pump can still work normally after 15 hours of operation without interruption. 3. Maximum Power Conversion: Low noise design and high efficiency, water cooling pump can achieve maximum power conversion, is a good RC accessories. 4. Cooling Function: It is used for electric regulating water cooling of ship model motor. Draw the water into the cabin and connect the copper water cooling ring to cool the motor. 5. For RC Boat: The motor water pump is used on the remote control boat for water cooling, and is suitable for 15MM 26MM 40MM caliber. Specification: Item Type: RC Water Pump Material: Plastic, iron Weight: Approx. 62g/2.19oz Total Length of Pump: 73mm/2.87in Outer Diameter of Motor: 24mm/0.94in Outer Diameter of Pump Head: 27mm/1.06in JST Wire Length: 10cm/3.94in Receiver Wire Length: 30cm/11.81in Operating Voltage: 5V-7.4V Size of Water Pipe Used: Water outlet diameter 4.2 can be equipped with water pipe with inner diameter of 3-4mm Applicable to: 15MM 26MM 40MM caliber. Package List: 1 x 370 Water Cooling Pump Note: 1. Please allow 1‑3mm error due to manual measurement. thank you!2. The calibration of the display is not consistent, and the color of the item displayed in the photo may be slightly different from the actual object.