Epoxy resin painted steel body - Brass automatic air vent - Brass shut off valve - Brass hose thread drain valve on bottom - Type 300 stainless steel internal baffle - 150 PSI maximum working pressure - 32 degrees to 210 degrees maximum working temperature range with insulation - 32 degrees to 250 degrees maximum working temperature range without insulation - For use with water and up to 50 percent maximum glycol antifreeze