Based on this product's specifications, here are some alternatives and similar models
Karcher suction tube NT DN35 505 mm stainless steel for industrial vacuum cleaners
Summary description:
Stainless steel suction tube by Karcher, model NT DN35 with a length of 505 mm. Designed for use with compatible industrial and wet/dry vacuum cleaners featuring DN35 connections. Provides durable, corrosion-resistant intake for reliable debris and liquid pickup. Ideal for workshop, construction or commercial cleaning where a robust metal suction tool is needed.