I've been reading the old posts on this ng about the Sealand 965Msd and
the Traveler. They are attractive to me because they seem simple,
versatile, compact and are generally getting good reviews on this ng.
However, I haven't read a discussion of how (or whether) to vent these
holding tanks in a fixed (permanent or semi-permanent) installation.
Is venting advisable? Necessary? Should venting be accomplished via a
"Y" or "T" in the pumpout hose?