PrimoChill Vortex Clear PMMA Flow Indicator is the latest in a slew of new products that PrimoChill is offering. It"s catered towards the modders and their need for color!!! What makes the Vortex unique and not like anything on the market today is its size, simple install, and extensive color combinations all in one awesome little package.The Vortex Flow Indicator was designed as a DIY part that the user can switch out the front/back/gear colors with the simple turn of a screw. Whether you want a UV Blue front and a UV Green back, the choice is yours. The Vortex has three threaded G 1/4 ports, one on the left , one on the right and one on top. The top port is perfectly centered for the use of a LED port cap to add a little light to the Vortex. The inside gear will spin to give you a visual indication that the water in your loop is moving (your pump is still running). Certain to be copied, but remember that PrimoChill"s Vortex Flow Indicator are Made in the USA, by Americans.