Joe,
My 322 only has the port aft fishbox plumbed to the macerator pump. How do you recommend using that set-up? For example, put a plug in the box drain til finished a trip then drain by gravity thru the rear drain while on lift, or keep rear valve closed and use macerator to drain box?

Secondly, how do you recommend I plumb the aft and forward midline boxes to the/a macerator? Can I just use a t-fitting inline before the macerator to put all three on a single macerator? Or add 2 macerators and use t-fittings to drain after the original macerator?

Thanks for any help.

Charlie