These bladder-type tanks provide permanent separation of air and water. All wetted components are built of FDA-approved materials. Available in 11 models to meet all your potable water needs. They feature a removable heavy-duty Butyl rubber bladder, fabricated steel shell designed and constructed per ASME Section VIII Div 1. Each is factory pre-charged to job specifications. Standard bladder: 125 PSIG (862 kPa). Optional bladder: 150 PSIG (1,034 kPa).