Marine Toilet unknown wall mounted doohickey

It's for putting sanitizer crystals in to stop the toilet smelling. I had one on my boat and purchased the crystals for it. Toilet continued to smell and the crystals blocked the pump and knackered the motor necessitating replacement for £500.

My advice, do the job properly - replace the pipes with high quality butyl ones. Chuck the sanitizer in the bin and consider a way of flushing the toilet with fresh water.
 
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