Botanicare Ebb & Flow Fittings Kit. The Overflow contains 2 risers, 1 screen, and a 3/4" barbed outlet, The Inlet contains 1 1/2" barbed inlet, and 1 screen. Botanicare fittings are used by professional greenhouses. These fittings are made of heavy duty plastic and require a 1 1/2" hole for mounting. Each piece is threaded for minute adjustments. Will flood a table approximately 3".