The old holding tank was 10-y-o stainless, and Peggie put the fear in me that it would permeate at some point.
The new Poly holding tank from Ronco. All connections are at the top and upper-sides within 1 inch of the top. (After this image was taken the overboard discharge pump mounting was made more secure). I also changed a failed macerator to a more reliable diaphragm-type Sealand Sanipump that can be run dry without harm.