[C320-list] DUCKBILL VALVE IN VENTED LOOPS

[Jeff Hare]

Also, Defender.com has these as well.

Forespar MF-841 Replacement Duck Bill / Cap Assembly   $9.99/ea

-Jeff

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of JJ Morrison
Sent: Thursday, August 15, 2013 9:36 AM
To: Catalina List
Subject: Re: [C320-list] DUCKBILL VALVE IN VENTED LOOPS

There are 3 vented loops on my boat...one is in the port side cockpit locker
and is on the hull side readily visible as two hoses connected by a Marelon
loop at the top.This loop is for the raw water engine cooling system. The
other 2 are in the head and visible behind the little mirrored cabinets.
These two are the anti siphon loops for the head pump and macerator. There
is a little Marelon nut on the top of the loop which screws off and contains
the rubber duckbill valve. What this does is allows the line to be
pressurized but prevents a vacuum from being formed and potentially
siphoning water back into the boat. Have a look at this link for an
explanation as to why vented loops are essential.
http://www.myboatsgear.com/vented-loops
CheersJohnM1999#574
> From: rick at inflateco.com
> Date: Thu, 15 Aug 2013 05:22:29 -0700
> To: C320-List at Catalina320.com
> CC: c320-list at catalina320.com
> Subject: Re: [C320-list] DUCKBILL VALVE IN VENTED LOOPS
> 
> What and where is this loop and valve, sounds like a potential problem.
Want to check mine and buy spare . Don't like sinking
> 
> Thank you and please excuse any grammatical and/or  typographical  as sent
from iPhone.
> 
> Rick Portanova | President | CEO
> INFLATE CO, INC.
> www.InflateCo.com
> 949-340-0104 Office
> 
> 
> On Aug 15, 2013, at 4:48 AM, JJ Morrison <sail-ability at sympatico.ca>
wrote:
> 
> > I had asked about procuring duckbill valves and I was not able to get
them. Need to buy the cap with the valve in it...$13 CAD from Forespar.
Related I had taken the duckbill out of the vented loop in the exhaust
system to see if the Chandlery had them. We subsequently went out on the
boat and the bilge pump came on and wouldn't shut off, water was pouring in.
I tore the boat apart looking for the wet spot...nothing. I then opened the
port cockpit locker and everything was soaked and a vicious stream of water
was being pumped into the boat out of that  vented loop. The engine was shut
down and the stream stopped of course...duh!! Luckily I had that tiny rubber
valve in my pocket and put it in place.There's a lesson here!I'm in the
process of replacing all three vented loops with new ones. The caps with
valves are not expensive but just the rubber can't be more than
50cents!CheersJohnM1999#574                         
> 
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