... tank ,inlet-outlet, is the flange cover and connector which are made of stainless steel.Bestanks ... in combined with irrigating pumps, centrifugal pumps and other hydrophore systems in a safe way…………… ... the bottom of the tank*Flange cover and water connector made of stainless steel material*Resistant ... membranes, hygienic certified, approved by European Union and USA Institutions*DIN4807-3,NSF-61,WRAS, ...