Skip Gundlach wrote:
The owner's manual shows vented loops, but I'd missed them in my
prior perusal online of them, as it's so counter-intuitive given the
short, direct, installation of the line between the pump and the
bowl.

It's only counter-intuitive if you don't read the directions.

However, the OM also shows the "TWK" which is for odor control and
lubrication, using "Raritan Concentrate #CON22". Your prior comments
indicated you thought odor control - through these presumed
expensive options, which our boat had - unnecessary - but this refers
also to lubrication.

You don't need the TWK (toilet water kit)...It doesn't lubricate any
better than plain water does. Raritan Concentrate is a nasty chemical
(quaternary ammonium compound) left over from the days when all toilets
flushed directly overboard. Its only real purpose was to "sanitize" the
waste slightly to reduce odor as it went out. Raritan has strongly
considered discontinuing it, but still sell enough of it that they keep
talking themselves out of doing so.

So, how does one (preventive maintenance) lube a PHII without
disassembly?

One doesn't. But it's not THAT much of a PITA to lift the pump off
the base and shoot some teflon grease into it just once or twice a year.

Secondly, referring to another part of this thread, I see in our
heads that a proper shutoff...

I'm not sure what you mean by "proper shutoff"...seacock?

... is immediately adjacent to the intake to
the pump body (see my December gallery for illustration, as I redid
the intake to that point). If placarded for guests, and known for us,
to have that shut when not in operation, does that suffice and is it
recommended procedure vs the antisiphon loop?

No. Neither a seacock nor any other shutoff valve in a line is a
substitute for a vented loop...they serve two completely different
functions in addition to protecting people from themselves. All the good
intentions and placards in the world cannot guarantee that no one will
ever neglect to close a seacock or never leave the toilet in the "wet" mode.

--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://shop.sailboatowners.com/books...ku=90&cat=1304