Features: brand new and high quality This flow indicator is used to observe the water flow rate of the water cooling system, in for case the pump stops working and causes overheating. Simple and practical, easy to install, small size and durable. The black impeller is convenient for observation, normally used in computer or other water cooling systems. The G1 / 4 inch thread is widely suitable for most computer cooling tubes or connectors. 8-impeller design improves cooling efficiency. Specifications: Product: BY8 impeller for turbine water flow meter Material: POM + Acrylic Color: black edge Thread: G1 / 4 " (2 points) Seal: silicone ring Length: approx. 77.5mm / 3.05 inch Width: approx. 47.5mm / 1.87 inch Thickness: approx. 19mm / 0.75 inch Quantity: 1 Function: the current meter is used to observe the speed of water flow in the computer water-cooling system, to avoid the water temperature overheating caused by the stop of the water anion pump, so as to protect the computer Package Includes: 1PC x Water Flow Meter note: The water flow meter does not include the connector. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!