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Every caravan I have had was slow to drain the sink.
Take the convoluted pipes out of the wastemaster and draining is quick, therefore it must be the upward curve to get the pipes into the wastemaster, or the ends of the pipes crammed into the neck causing an air lock.
I went to a well known DIY store and bought a length of 32mm plastic waste pipe, an elbow and two tee pieces.
The elbow is attached to the side branch of the tee with a short length of pipe, the inlet of the tee is attached to the sink drain socket with a short length of convoluted, the elbow is attached to the shower drain the same way. The outlet end of the tee is then connected to the side branch of a second tee, the outlet of which drops into the wastemaster the other leg has a short length of pipe pointing upward to act as a vent.
Result, I pull the plug after washing up and the water dissappears in a few seconds complete with whirl pool
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Topic: Rapid draining
