Condensation TrapWhen hot air from the toilet is discharged into the cold air outside, condensation is formed which can flow back to the toilet. For ventilation pipes mounted indoors, we recommend using a condensation trap that collects the liquid condensation. The condensation trap is mounted on the condenser connection on Cinderellas original 87 degree elbow. Remember to empty the siphon at regular intervals during cold periods. Note that the condensation trap