The hot/cold water inlets of a sink, before its installation. The plastic red/blue covering around the white tube is used simply to indicate whether the tube carries hot or cold water. The inner white tube is about 1 cm wide. The grey pipe is the drainage pipe. All cabling in this house is plastic; but these cables are still environmentally polluting (and not so very long lasting, nor repairable when broken) and copper and galvanized steel are better options (although these may not be as clearly marked in red/blue). Much smaller than the water tubing is the plastic electricity tubing, at left.