Based on this product's specifications, here are some alternatives and similar models
Suction tube set Karcher 2.889-191.0, chromed metal NW35, 550 mm, 2 pcs
Summary description:
Chromed metal suction tube set for Karcher vacuums, model 2.889-191.0. Each NW35 tube measures 550 mm in depth; kit includes 2 pieces. Constructed of metal with a chrome finish, total package weight 600 g. Designed for suction and extension applications with compatible NW35 fittings, suitable for replacement or expansion of cleaning equipment.