Alan,

I made a rig to backflush the vent line.  It consist of a toilet plunger and
a 'poop' collector.  The plunger is one of those that can hold a good amount
of water.  Here's a link to one:
https://smile.amazon.com/G-T-Water-Products-Inc-MP100-3/dp/B0006IXNDW/ref=sr
_1_14?ie=UTF8&qid=1498484557&sr=8-14&keywords=toilet+plunger.  The 'poop'
collector is made up from an PVC pipe fittings and hose.  It is basically a
1-1/2" reducing busing with adapters to a piece of 1/2" hose.  

If my tank vent clogs I can backflush the vent line.  First, pump the
holding tank as dry as possible.  Flushing air through the toilet helps.
Then hook up the 'poop' collector to your holding tank pumpout connection.
Route the hose to a bucket.  Take the plunger and fill it with clean water.
Hold the plunger against the tank vent where it penetrates the hull.
Depress the plunger to force water into the tank vent.  You may have to
repeat this several times.  Take a shop vacuum or your dinghy air pump and
pump air back into the vent line.  This will force any water out the vent
line.  You will notice dirty water in the 'poop' collector bucket.

You should be able to flush your vent line without disconnecting the vent
hose (very messy) and without pressuring the holding tank.  If you do have
to access the tank, here's a link to photos of my boat:
https://1drv.ms/f/s!AhpB-lul9d5YpgwQQIwkCopkxqSt.  The access hole on my
tank leaked so I replaced the cover and re-bed it with butyl rubber.  This
eliminated foul odor.

Good luck,

Ron

Ron Ricci
S/V Patriot
C&C 37+
Bristol, RI
ron.ri...@1968.usna.com

 


-----Original Message-----
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Alan
Liles via CnC-List
Sent: Sunday, June 25, 2017 7:32 PM
To: cnc-list@cnc-list.com
Cc: Alan Liles
Subject: Stus-List C&C 37/40+ holding tank

Has anyone on the list had to access their holding tank? My vent is plugged
and I need to access at least one end. There is a small access port in the
top of one of the vanity cupboards but that seems fairly useless as I can't
see much in there and my hands don't really fit. To get to the tank top it
looks like the sink and vanity top have to be removed which also involves
the shower plexiglass and support. Any ideas before I disassemble my entire
head?

Al Liles
SV Elendil
C&C37/40+
Vancouver 


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