Every vent and every anti-siphon pipe shall, unless carried up independently, be connected to a main vent at a point at least 150 millimetres above the top of the highest fitting which the main vent serves.
Every vent and every anti-siphon pipe shall, unless carried up independently, be connected to a main vent at a point at least 150 millimetres above the top of the highest fitting which the main vent serves.