Abstract: A novel swimming pool deck drainage system and expansion joint that are adapted to be cast into a concrete pool deck surface. The drainage system is designed to properly drain water from pool overflow and rain water from the decking while enhancing the aesthetics of the swimming pool deck. The drainage system provides an effective drainage for pool decks and effectively collects and carries water away quickly from pool decks and other patio areas. The joint system protects against cracking and buckling of the concrete deck surface. The decorative swimming pool joint and drainage systems are formed using a co-extrusion process. The drain and joint systems are made from an exterior grade of PVC. While the drain and joint components are being extruded, a cap stock made from ASA (weatherable ABS) material is extruded and fused into the top of the drain and joint. The cap stock material includes a base color and seed resin mixed with the ASA to provide a wood grain appearance.