Omron NE C29 Nebulizer - WhiteOverview The Omron NE C29 nebulizer is integrated with Virtual Valve Technology (V. V. A) that enhances the delivery of medication, reducing medication wastage. Initially, silicon valves were used to fulfill the functions of proper delivery of medication and reduction of medication wastage. However, the silicon valves were hazardous and unsafe but with the introduction of Omron's unique valve technology, you receive the benefits of the valve function