Soil Air Admittance Valve Position

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Why do you want to increase the height?

Because the soil vent is lower than the pan, & there is no room for the extra height. I can fit a boss with a 40mm waste pipe, terminating high enough for the water not to flow over, I`m wondering if a 40mm air admittance valve will allow enough air into the soil so the toilet wont gurgle.

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