A system comprising a liquid cooling system and a computing device, wherein the computing device includes a housing having one or more electronic components disposed therein; and wherein the liquid cooling system comprises: a rack configured to support the computing device installed in the rack; an input manifold configured to be fluidly coupled to the housing; an output manifold configured to be fluidly coupled to the housing; and a drain manifold configured to be fluidly coupled to the housing; wherein when the computing device is in a first position relative to the rack, the input manifold and the output manifold are fluidly coupled to the housing and the drain manifold is disconnected from the housing, and wherein when the computing device is in a second position relative to the rack, the input manifold and the output manifold are disconnected from the housing and the drain manifold is fluidly coupled to the housing, the system being characterized in that the computing device includes a drain connector configured to fluidly couple the drain manifold to an interior of the housing, the drain connector including a body (160A,160B) defining a fluid channel, a ball valve positioned in the fluid channel, and a pinion gear coupled to the ball valve, the pinion gear being rotatable to move the ball valve between a flow position and a sealed position, a portion of the body configured to be inserted into the drain manifold, the drain manifold including a rack gear configured to engage the pinion gear of the drain connector, wherein when computing device is moved to the first position, the body of the drain connector moves toward the drain manifold, such that the rack gear rotates the pinion gear to move the ball valve to the sealed position, and cooling liquid is unable to flow from the housing to the drain manifold through the fluid channel of the drain connector, and wherein when the computing device is moved from the first position to the second position, the body of the drain connector moves away from the drain manifold, such that the rack gear rotates the pinion gear to move the ball valve to the flow position, and the cooling liquid is able to flow from the housing to the drain manifold through the fluid channel of the drain connector. a rack configured to support the computing device installed in the rack; an input manifold configured to be fluidly coupled to the housing; an output manifold configured to be fluidly coupled to the housing; and a drain manifold configured to be fluidly coupled to the housing; wherein when the computing device is in a first position relative to the rack, the input manifold and the output manifold are fluidly coupled to the housing and the drain manifold is disconnected from the housing, and wherein when the computing device is in a second position relative to the rack, the input manifold and the output manifold are disconnected from the housing and the drain manifold is fluidly coupled to the housing, the system being characterized in that the computing device includes a drain connector configured to fluidly couple the drain manifold to an interior of the housing, the drain connector including a body (160A,160B) defining a fluid channel, a ball valve positioned in the fluid channel, and a pinion gear coupled to the ball valve, the pinion gear being rotatable to move the ball valve between a flow position and a sealed position, a portion of the body configured to be inserted into the drain manifold, the drain manifold including a rack gear configured to engage the pinion gear of the drain connector, wherein when computing device is moved to the first position, the body of the drain connector moves toward the drain manifold, such that the rack gear rotates the pinion gear to move the ball valve to the sealed position, and cooling liquid is unable to flow from the housing to the drain manifold through the fluid channel of the drain connector, and wherein when the computing device is moved from the first position to the second position, the body of the drain connector moves away from the drain manifold, such that the rack gear rotates the pinion gear to move the ball valve to the flow position, and the cooling liquid is able to flow from the housing to the drain manifold through the fluid channel of the drain connector.