Carvin Laser L250C 7C 25" Top Mount 1 1 2" Valve Sand Filter (94089250) champlain When the correct tool is When the correct tool is available and diffuser format give this kit practical value because hydraulic parts work best when they match each other and the intended pump relationship closely The Carvin Laser L250C 7C sand filter is designed for pool systems that need dependable top mount sand filtration in a 25 inch format This version with a 1 1 2 inch top mount valve is especially useful when a compatible filter needs replacement or when the application calls for a larger top mount sand filter with this connection style