Genuine Thetford replacement spare part. This SEM filter cone for the Electra Magic Toilet. No separate waste tank or water supply is required for this toilet system. The toilet is filled with water and toilet additive, pumps recycle the fluid and a double filter system collects the waste. Disposal of waste is through a valve underneath the vehicle. Circulating pump Never gets blocked Electric flush Waste capacity: 14.3L Part No 35773