The PD40 series is available in 8 different models: * DC PD40 - Basic Model * DC PD40A - with Break Tank * DC PD40D - with Break Tank & Drain Pump * DC PD40AIS - with Break Tank and Integrated Water Softener * DC PD40AISD - with Break Tank, Integrated Water Softener & Drain Pump * DC PD40D - with Drain Pump * DC PD40IS - with Integrated Water Softener * DC PD40ISD - with Integrated Water Softener & Drain Pump