For a complete list of available spares please visit www.showerdoc.com
Water inside a new unit
Assuming you received the unit in a sealed box this is normal. Some manufacturers test units before sending them out. Water in a new shower unit is generally a good sign as you know it has been tested by the manufacturer.
The off switch has become stiff or hard to turn
You may have a faulty flow valve assembly.
A replacement can be purchased from: www.showerdoc.com