EK-Quantum Scalar Flow Indicator is a premium GPU-mounted flow indicator with addressable D-RGB implementation. It visually represents the coolant flow rate, which is often hard to see with the naked eye. This can be very useful to instantly see if your loop operation is nominal or there\'s trouble with the pump or flow in some other area... and let\'s face it, it looks cool! Aside from that, it perfectly blends with your GPU block and backplate due to the aesthetic black anodized aluminum cover that matches the finish of the GPU water block backplate.It features dedicated G1/4\" In and Out ports. It is MANDATORY to follow proper setup as the ports are labeled. Please, consult the manual before installing it. This variant has a top-bottom flow pattern, where the liquid is supposed to enter on the top left port and exit out of the side on the bottom. The flow indicator features a unique impeller body with a closed center and sloped impeller wings which prevent air from being stuck inside the indicator.This product is compatible with popular RGB sync technologies from all major motherboard manufacturers as well as the EK-Loop Connect controller. The arrow marking on the 3-pin addressable LED connector is to be aligned with the +5V marking on the D-RGB (A-RGB) header. To follow the EK Quantum design language, an anodized aluminum cover is used to hide the LED hotspots and offer even lighting across the whole device.This flow indicator is manufactured out of CNC machined cast acrylic material with an anodized aluminum cover that has the same finish as EK-Quantum Vector GPU backplates. Enclosed:- EK-Quantum Scalar Flow Indicator Top-Bottom D-RGB - Black- G1/4\" nickel-plated brass plug x 1Note: The port that has already a plug installed is not usable! The opening is only a part of the manufacturing process.