Waterco Side Mount 2" 6 Pos Multiport Valve (2290590) tools The PSXVDE is a practical The PSXVDE is a practical service part when a compatible Hayward PSV valve needs a key assembly to restore dependable flow control This version is especially useful when the installation depends on the boxed heater format rather than a simpler unboxed replacement This replacement is especially useful when the original side mount valve has become difficult to switch A multiport valve in this style is useful because it centralizes major filter functions in one assembly while matching layouts where side mounting is the correct configuration