Source: https://www.sulzer.com/spain/-/media/files/products/pumps/submersible-pumps/product-information/submersible-heavy-duty-pumps/submersible-propeller-pump-type-abs-vupx/manuals/xfp_pe4_pe6_aflx_vupx_pe3_pe6_ng2_installation_and_operating.pdf?la=fr-fr