Draper expert 20m water level accessories draper expert 69565 b i expert quality i b ideal for blind room to room measurements and for checking gradients over long distances hose is filled with water and level is found when both graduations chosen are the same comprises 20m approx length of pvc hose graded in 0 5 and single centimetre graduations funnel colouring crystals water stop plugs and marker rings manufactured for draper tools by kapro shrink wrapped with descripti