974 MSD or 975 MSDPowerful flushing at the touch of a button. Requires no manual pumping or batteries. An easy-view level indicator lets you know when to empty the holding tank. High-strength ABS construction. Full-size seat provides user comfort; latching lid stays secure while underway. Splash-free tank design. MSD models can be installed for direct overboard, dockside pump-out, or remote tank discharge. Includes mounting brackets and MSD fitting.