Hot Tub Compatible With Dynasty Spas Drain Valve DYN11942Hot Tub Compatible With Dynasty Spas Drain Valve DYN11942 Skirt Mounted Drain Valve. 1 2 Inch Plumbing. To operate, pull the spout out, leaving the exterior end cap on. Once extracted, by design, the Drain Valve will stay in the closed position. After the garden hose is installed, push the spout back in halfway to actuate the drain. The valve is also equipped with a removable bezel in order for the skirt to be detached without disturbing the plumbing.