Multistage submersible pumps TOP MULTI 1-AD are designed to pump clean liquid,which is defined according to standard ISO 22241 as AUS 32 (Aqueous Urea Solution 32.5%). This liquid is equivalent to other commercial trademarks known as: – AdBlue® (trademark registered by Verband der Automobilindustrie VDA); – DEF (Diesel Exhaust Fluid); – Arla 32 (Agente Redutor Liquido de Óxido de Nitrogênio Automotivo). Multistage submersible pumps TOP MULTI-AD are designed using materials compliant to this liquid; their use is subjected to local laws and directives.