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The Purus Basin/Bidet Waterless Waste with revolutionary PUM – Purus Universal Membrane – technology is a new low-level membrane which saves space without reducing the flow capacity, by replacing current S-traps and P-traps.
It is suitable for basins and bidets with either 1¼" or 1½" wastes.
It also functions as an air admittance valve when there is a negative pressure in the drainage system (secondary air ventilation), which gives much better flow in the drainage pipe. The new technique stops bad air coming up through the drainage system.