In most cases, no. The faint odour that may come from the urine hose is drawn out through the vent pipe due to the action of the fan. A water seal is only needed if a strong odour from the greywater system would be noticed inside or outside the house.

If needed, we sell a Separett in-line trap for the urine pipe.

If you are using standard rigid pipework, look at products such as the HepVO inline trap.

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