The DD series are push-pull, lever operated, double diaphragm, hand-pumps for water, soft solids (in suspension), oil drainage and transfer. The lever is 380mm long. They have a cast aluminium construction, steel operating lever and nitrile diaphragms. As an alternative, Viton®, Butyl or Neoprene diaphragms can be fi tted, at an extra charge, for compatibility with other liquids, e.g. red or white diesel and bio-diesel. The portable version, with a base-plate, is designed for site use and has a 600mm long lever. It is also supplied with a strainer and hose clips.