Image 1 of 1 Additel 9231 - Contamination prevention system, for ADT760A, with communication cable $875.00 Add To Cart Added! Additel 9231 - Contamination prevention system.Part Number: 9231. Additel 9231 - Contamination prevention system.Part Number: 9231. You Might Also Like Additel 9723 Spare Chargeable Li-ion Battery for Additel 761 Calibrator $619.00 Additel 959-MK Maintenance Kit for ADT959 Generator $132.00 Additel 9055 - Green terminal plug (drive valve for I/O) 1 pc $14.00 Additel 9904-912 - Carrying case for Additel 912 Generator, and two gauges (No label) $525.00 Additel 100-946-HK Hose Kit for ADT946 Pump $124.00