FLORAFLEX - INCUBATOR 50 CELL 40|40 INNER TRAYThe Incubator 50 Cell 40 40 Insert Tray 1. 25" was engineered to house the FloraFlex Incubator? Plugs and propagate plants in their earliest stages of life, use the full incubator system for optimal results. To use simply insert seeds cuttings into Incubator Plugs, then place plugs into the Incubator Insert Tray's cells. The FloraFlex Incubator System is designed to accelerate growth through patent pending aerated convection.