Designed to allow full use of storage space below the basin within cabinet or furniture. Internal membrane opens under water pressure to allow discharge to flow freely and then closes to form a seal to prevent foul odour or sewer gas entering the building. Valve
Designed to allow full use of storage space below the basin within cabinet or furniture. Internal membrane opens under water pressure to allow discharge to flow freely and then closes to form a seal to prevent foul odour or sewer gas entering the building. Valve