Regal 3300 Owner's Manual page 221

Transom Hand Shower
Simply turn on the faucet and adjust for the desired water temperature.
https://www.boat-manuals.com/
Features
The transom hand shower
supplies warm, fresh water
after swimming. The hand
shower is especially useful
when the boat is run in
saltwater. The hand shower
is an integral part of the
boats freshwater system.
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