I've often wondered it this setup requires a "lock" on the pumpout to
comply with 33CFR159. Most descriptions of the reg refer to
"preventing accidental discharge" or securing a "direct discharge"
line. It would appear that the chance of an "accident" on your system
is essentially nil. Mine is similar, except that it includes a
y-valve to allow for either a manual pump discharge, or a deck
pumpout. Since the y-valve looks like one that might permit direct
discharge, I often keep a cable tie on it. I could also lock the
hatch or hide the pump handle, but I'd probably lose the key or handle!

Unfortunately, the actually CFR doesn't actually mention "accidental"
or "direct discharge." It more generally requires securing any means
of discharge. If the holding tank is considered part of the MSD Type
III system, then it would seem its pumping system would be included.

33CFR159.7


Roger Long wrote:
I've had very good luck with this very simple set up shown on this and the
following page.

http://home.maine.rr.com/rlma/Strider0601.htm

No "Y" valve, no macerator pump. You have to pump by hand but, hey, we
could all use a little exercise at our age.

....