Proportional doser for producing ready-to-use precleaner solutions. Optimally suited for operating low-pressure lances (eg PVC 600 mm lance, 999419). Thanks to a patented mechanism (no Venturi principle) the same dilution is produced even with fluctuations in the water pressure. This system prevents the material wastage that frequently occurs with manual premixing and is therefore extremely economical. With water hammers (same water supply pipe with high-pressure appliances or carwash) we recommend the installation of a pressure reducer. Suitable for neutral and alkaline products. Dosing range: 1 – 10%. Operating pressure: 0.5 - 6 bar. Water throughflow: 10 l/h - 3000 l/h.