1 1/2" base. PlasticConcealed cistern kit which includes WRAS approved side entry valve, a 1½" to 1½" flush pipe, back to pan connector, and a concealed cistern and blanking plug. Made from ABS plastic with a maximum filling volume of 6 litres. Ideal for use with the DVS WC Flushvalve kit with touch free wave on sensor.Plastic5 Years2.18kgConcealed cisternIdeal for use with DVS Flush valve kitWras approved side entry valveback to pan connector and flush pipe6 litre max fill volume