Features: With impellers design improves the cooling efficiency. G1/4-inch thread is widely fit for most computer cooling tubes or connectors. Convenient for observation, normally used in computer or other water cooling systems. Made of high quality alloy material with compact size, the water flow indicator is easy to install and use. This flow indicator is used to observe water flow speed of water cooling system, in for case that pump stops working and causes overheat. Specifications: Material: Alloy Outer diameter: 12.9mm/0.5in Thread: G1/4" Note: Please allow 1-3cm 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. Package includes: 1x Water Flow Indicator