Preventative Maintenance Kit for Accessory STER301 (H2O2 Sterilization Module) Includes (1) FIL-121 Ultrasonic Nebulizer Wick, (1) FIL-123 Silver Catalyst Filter, (2) MTL-0298 VHP Bussbar and (1) PLS-131 VHP Catalyst Plate. Detailed Instructions Included.