[C320-list] Another head question

[T. Scott Thompson]

According to Nigel Calder's book you should have an anti-siphon loop on 
the output side of the head if you are connecting to an overboard 
discharge.  He suggests one that vents vertically through a hose.  The 
reason there is no such provision on most 320's is that most 320's do 
not have a Y valve for direct overboard discharge, I suspect.  Were 
these ever installed by the factory?  My boat has none.

Scott Thompson
Surprise, 653

Darrell wrote:
> I am curious why if there is an anti siphon loop on the head intake 
> hose why there isn't one on the head output hose, couldn't the same 
> thing occur if you had the Y valve switched to pump directly overboard 
> and you left the thru hull open . I don't think I would trust the 
> flapper valve in the head to prevent the toilet from flooding.
>
> Darrell, #88