[Function]: This flow indicator is used to observe water flow speed of water cooling system, in case that pump stops working and causes overheat [Fitment]: G1/4inch thread is widely used for most computer cooling tubes or connectors [Material]: Made of high-quality POM and acrylic material, this flow indicator is durable to use [High Performance]: 8 impellers design improves the cooling efficiency; Easy to install and use [100% Satisfaction]: If you have any question about this item, please feel free to contact us, we will help you within 24 hours on week days