Pentair Mastertemp 125 Tube Sheet Coil/Heat Exchanger and O-rings seals ONLY - from Assembly Kit - 474971. Brand New, Genuine Pentair parts, never used or installed. This is the coil/ heat exchanger only! It came as part of Pentair Tube sheet coil assembly kit that was not used. 1- Part of the insulation fit. 2- Combustion chamber gasket kit - Part # 474952.