Mighty Therm, Pump housing Kit, includes, R10261501 Pump Housing (Volute) glass lined, S0024600 Gasket (between pump housing & pump adaptor), S0095100 Header Gasket, A0021400 Pump Gasket (between pump & pump housing), Mighty Therm 500-1825, Pennant 500-2000, This pump housing kit must be used to convert a Armstrong pump application to a B & G (Bell & Gossett) pump application.