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CC21 locker drains

tntongue Member Posts: 6
Noticed the port side below deck locker was not draining (2018 CC21 with pumpout lav). I found that the drain line feeds into the corresponding port side macerator pump.  Running the pump while pushing water through cleared things up but.....draining a locker through a macerator pump?  Why? Is a plumbing diagram available anywhere for this boat?