SMT VacMaster® I Central Wet Vac Main Unit (low pressure) The SMT VacMaster® I can be purchased for retrofit installations. The SMT VacMaster® is perfect for retrofitted restaurants without floor drains. Like the SMT Central System, the VacMaster® is placed centrally and ran out to remote locations. In less time than it takes to fill a mop bucket you will be washing, rinsing, and sanitizing your floors; while at the same time vacuuming excess water and gray matter from the gaps in your floors.