Double-walled stainless steel insulation keeps beverage warm/cold for 8 hrs, Traditional growler kegs will let carbonated drink go flat after the first pour but not this 128 oz keg, it keeps beer vacuum pressured & fresh for weeksAdjustable Pressure RegulatorEasy to Assemble - Easy to Fill - Easy to CleanDetachable Regulator and Spout Under PressureBlack Premium Scratch Resistant Powder CoatingHomebrew CO2 System Keeps Carbonated Beverages Fresh All Day