6 inches Aluminum Evaporative Pad Systems 6 inches Aluminum Evaporative Pad Systems Water Distribution and Return (Aluminum ) Pump (All Systems not include the correct size least expensive single phase pumps ) Plumbing Kit Evaporative Cooling Pads 6 inches Tall Pad Supports (Required on 6 inches Systems 60" & 72",84" & 96" Tall) Sump (Not furnished on Aluminum systems)