[C38] Vented loop for head discharge

[les]

Thanks, Steve, 
	I knew someone would put me straight.  But the hose routing is correct.

Regards,
Les H
On Wed, 2011-11-02 at 08:24 -0700, Steve Smolinske wrote:
> http://www.boatus.com/boattech/casey/13.htm
> http://www.thetford.com/HOME/PARTS/PermanentToilets/Headmate/tabid/575/D
> efault.aspx
> 
> Don Casey actually recommends that you do not put a vented loop on the
> intake and that you do put one  on the discharge.  Attached excerpt from
> Boat  US has a page from his book.  Our heads the Wilcox Crittenden
> Headmate (now Thetford)  has a duckbill ball (joker), then there is a
> flapper valve in the toilet base.   Link to the manual is attached the
> duckbill is #23 and the flapper is #32 in the blown up schematic.   
> 
> On the inlet side there is another  flapper valve that is engaged with
> the flush or  dry flush option via the small lever by the pump handle.
> This should  never be left in the dry position, I know many people leave
> it in that  position when finished with the head in order to leave the
> inlet line through hull open, and yes while in that position it does
> stop the water from entering the bowl, however the flapper valve is a
> rubber gasket with a small disc riveted to the flapper, This seal will
> and does take a compression set and the metal disc will deform if  left
> in that  position.  I know because I  just replaced it because  my head
> would no  longer work,  I talked to  Thetford who told me do not  leave
> your boat head in the dry flush position.
> 
> Steve