If you want to build a water-cooled system without spending too much on the fittings, these PrimoChill stop plugs are an excellent choice. A satin black finish means you will never have to worry about ugly fittings that have no style. Leaking is a thing of the past with these fittings thanks to their high quality construction. Feel how tight these screw on compatible threading. Sometimes you won t need to use all the ports for tubing, so instead you have to plug them or risk leaking. All these neat features are available for you at a very affordable price.