Our best drain down levels ever as low as 10mm or 1/3’’. SEAFLO Narrow, Low profile bilge pump fits deep down in small/awkward bilge spaces where other pumps won’t fit. Compact, Horizontal or vertical mounting, with 360 Degree Discharge for easy remove and replace and leaves the bilge almost dry. Port Type 3/4″ (19mm), 1″ (25mm), 1 1/8″ (29mm) Straight Hose barb or 3/4″(19mm) 90o Elbow together with pumps to meet different installation request. Automatic turns on and off when water rise down.