Features: This flow indicator is used to observe water flow speed of water cooling system, in case that pump stops working and causes overheat. The design is novel, simple and practical, easy to install, small size and durable. Green impeller is convenient for observation, normally used in computer or other water cooling systems. G1/4 standard thread is widely fit for most computer cooling tubes or connectors. Apart from observing water flow, it is also a great and delicate decoration. Specifications: Material: Tungsten alloy Thread Standard: G1/4" Quantity: 1pc Package Includes: 1 x Water Flow Indicator