Vaillant Condensate Trap and Siphon 20141345Vaillant Condensate Trap and Siphon captures the discharge which begins to build in the primary heating and cooling system. This is caused by the changes in the pressure and temperature within those systems. A discharge pipe joined to the condensate trap then allows any held water passage out of the property. The water within a condensate trap may be mildy acidic due to carbon dioxide from the combustion process dissolving in the water. Available in