KWC DVS Compact Concealed Plastic Cistern KitCompact Concealed Plastic Cistern Kit The KWC DVS Compact Concealed Plastic Cistern Kit is a complete kit perfect for any washroom requiring a concealed cistern. This kit is also WRAS approved, meaning it complies with strict WRAS standards and regulations. This compact concealed plastic cistern kit includes everything needed to install a concealed cistern, including: WRAS approved side entry valve 1 1 2" to 1 1 2 flush pipe back to pan connector