GL: Y valve lockout

[Keith]

    (b) When operating a vessel on a body of water where the discharge
of treated or untreated sewage is prohibited by the Environmental
Protection Agency under 40 CFR 140.3 or 140.4, the operator must secure
each Type I or Type II device in a manner which prevents discharge of
treated or untreated sewage. Acceptable methods of securing the device
include--
    (1) Closing the seacock and removing the handle;
    (2) Padlocking the seacock in the closed position;
    (3) Using a non-releasable wire-tie to hold the seacock in the
closed position; or
    (4) Locking the door to the space enclosing the toilets with a
padlock or door handle key lock.
    (c) When operating a vessel on a body of water where the discharge
of untreated sewage is prohibited by the Environmental Protection Agency
under 40 CFR 140.3, the operator must secure each Type III device in a
manner which prevents discharge of sewage. Acceptable methods of
securing the device include--
    (1) Closing each valve leading to an overboard discharge and
removing the handle;
    (2) Padlocking each valve leading to an overboard discharge in the
closed position; or
    (3) Using a non-releasable wire-tie to hold each valve leading to an
overboard discharge in the closed position.

[CGH 95-028, 62 FR 51194, Sept. 30, 1997]
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That all being said, if you're considering a Y valve for the holding tank, 
think about putting two discharges if you're getting a new tank. One to the 
overboard discharge, the other to the pump out fitting. That way you don't 
even need a Y valve. One less thing, ya know...


Keith
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Did you know that SATAN is an anagram for SANTA?