Viessmann Neutralization Kit. The Viessmann Neutralization Kit is only intended for use with unmodified drinking water boilers which is the system being used. Any adjustments installation service or maintenance must be completed by a licensed professional heating contractor who is qualified to work with hot water boilers particularly with older technology including high sulfur direct vent (HVA) boilers old cast iron gasifiers and wood-burning boilers. Package Contents: Viessmann 7740947 Neutralization Kit Viessmann 7740947: Neutralization Kit