Masterkidz STEM Wall Pipe Builders - 119 PiecesThe Masterkidz STEM Wall Pipe Builders Set is an exciting hands on learning resource that allows children to explore water flow, direction, and motion in a fun and creative way. Designed for use with the Masterkidz STEM Wall (sold separately), this 119 piece set includes a variety of connectors white 90 and 135 elbows, T connectors, long flexible tubes, and accessories such as two large valves, a working tap, five colourful balls, plastic pouring