The G1 / 4-inch plug fitting with O-ring is used in the computer water cooling system, which can effectively prevent water leakage, make the water cooling system safer and more reliable, and have a longer service life. Material brass: it is made of solid copper, with long service life, wear-resistant material and improved durability. It can be tightened by easy tool free installation: the front end is slotted, and the joint can be tightened with a one dollar coin; Diamond grain surface to increase hand feel and friction. Equipped with sealing ring: O-ring, seamless connection; Large inner diameter ensures high fluidity and unrestricted water flow. Package content: 4 electric water-cooled G1 / 4-inch air tight water stop plugs.