... 2,Fast heat response 3,Various sizes Electric Flange Immersion Tube Heater Hongtai flange heaters, both round flange and square flange models ... .When you order the flange heater, please note the specifications as follows:1,Flange size and tube length, if have drawing will ... non corrosive)4,Working environmentProduct shows of Electric Flange Immersion Tube Heater: