A diagram illustrating the sanitary (drainage) installation for a bathroom, showing how a sink, toilet, and shower drain are connected to a common drain line. It's a schematic representation, likely used for educational or illustrative purposes. Key Features and Analysis: 1. Title: "SANITARY INSTALLATION" indicates the topic of the diagram. 2. Bathroom Fixtures: * Sink: A simple, rectangular sink with a faucet is shown. * Toilet: A standard toilet with a tank is included. * Shower: A shower base