This flow indicator is used to observe the water flow speed of the water cooling system, in case the pump stops working and causes overheating Simple and practical, easy to install, small in size and durable Black impeller is convenient for observation, normally used in computer or other cooling systems G1/4inch thread is widely suitable for most cooling tubes or connectors for computer 8-wheel design improves cooling efficiency Features: This flow meter is used to observe the water flow speed of the water cooling system, in case where the pump would stop working and cause overheating. Simple and practical, easy to install, small in size and durable. The black wheel is convenient for observation, normally used in computer or other water cooling systems. G1/4inch thread is widely suitable for most computer cooling tubes or connectors. 8-wheel design improves cooling efficiency. Features: Material: POM+Acrylic Optional Color: Black Thread: G1/4" Joint: silicone ring Length: approx. 77.5mm/3.05inch Width: approx. 47.5mm/1.87inch Thickness: approx. 19mm/0.75inch Weight: about 39g Package Included: 1 x Water Flow Meter