Procedure to Avoid Frost Damage in Water

Close both seacocks and hang a notice on the toilet to ensure that people do not use it. Disconnect the inlet pipe from the flushing pump and the seacocks and drain the pipe. 

Empty water from the flushing pump by moving the inlet pipe away from the bottom of the pump, raising the spindle and tripping the lower valve with the finger. Hold until the pump is empty. 

Disconnect the discharge pipe at the seacocks, place the end into a bucket and pump the discharge water into the bucket. 

Ideally, the discharge and inlet pipes should be disconnected from the toilet and complete toilet removed from the boat by undoing the bolts at its base. Take the toilet ashore and drain the flushing pup as above and the discharge pump by tilting the unit and allowing the water to flow out of the outlet. Disconnect the inlet and discharge pipes from the seacocks and drain them.