Rule ''STC'' Tournament Series Removable Motor Cartridges are built on Rule’s unsurpassed quality and leadership in pump design and technology. The innovative design includes many exciting features including a quick, one hand “push button” motor cartridge removal system, patent-pending rotatable base that allows you to position the discharge nozzle at any location, and threaded nylon hose barb attachments, which allow for various hose mounting options. Other features include a built-in dual port option, water-cooled housing, and positive snap motor cartridge locking mechanism.