Regal 53 SC Owner's Manual page 138

Transom Shower
Your yacht offers a hot and cold transom shower located
at the port stairway near the swim platform. To use, make
sure the fresh water pressure pump breaker is activated at
the ship's AC/DC control panel. Open the hot and cold
sides and regulate the temperature. Always test the water
temperature before using the shower nozzle.
Shower Head
Hot Water
Faucet
Cold Water
Faucet
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Chapter 4