I have a vented loop on ours.  You may want to check again.  It is just aft of 
the holding tank and nearly at the deck height.

Tom Buscaglia
S/V Alera 
1990 C&C 37+/40
Vashon WA
P 206.463.9200
C 305.409.3660


> On Feb 2, 2019, at 10:21 AM, cnc-list-requ...@cnc-list.com wrote:
> 
> Message: 1
> Date: Sat, 2 Feb 2019 12:35:11 -0500
> From: "Matthew L. Wolford" <wolf...@erie.net>
> To: <cnc-list@cnc-list.com>
> Subject: Re: Stus-List Head plumbing...
> Message-ID: <1331C0E0469945FAB46416064D915925@InternetPC>
> Content-Type: text/plain; charset="utf-8"
> 
> FWIW, both of my C&Cs had/have vented loops.
> 
> From: Chuck Saur via CnC-List 
> Sent: Saturday, February 02, 2019 11:01 AM
> To: cnc-list@cnc-list.com 
> Cc: Chuck Saur 
> Subject: Stus-List Head plumbing...
> 
> All this chatter about plumbing raised, for me, a related question for you 
> 37+ guys.
> I am changing a leaking, not really serviceable toilet to a new one, and plan 
> to change the hoses as well.  On the 37+ there appears to be no 
> factory-installed vented loop on discharge line.  Not one on my ex-boat, a 
> 35-3 either.  Seems that a vented loop is recommended by toilet makers to 
> avoid backup when heeling.  
> Has anyone upgraded and installed vented loop?  Or is there a rationale for 
> not having one on our boats?  Puzzled.
> 
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