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09-20-2018, 01:51 PM
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#1
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Junior Member
Join Date: Aug 2018
Posts: 6
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3-1/2 holding tank flush valve cap
Where to buy?
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09-20-2018, 02:16 PM
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#2
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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09-20-2018, 02:32 PM
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#3
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,406
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The caps that Bob has shown, LINKS , are not for flushing the tanks , but for draining a grey tank into a garden hose , are you looking to introduce , water pressure to clear a plugged valve or line from the valve to the tank , you need one of these. 
Otherwise , with the caps in the links, water pressure in has no way out .
The flush attachments are available at any RV parts supply.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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09-20-2018, 05:26 PM
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#4
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Junior Member
Join Date: Aug 2018
Posts: 6
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Problem is , the cap is 3-1/2 fitted diameter.......not 3" like every other rv that I've owned..
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09-20-2018, 05:49 PM
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#5
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Senior Member
Join Date: May 2017
Location: Vancouver Wash
Posts: 7,227
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Think I'd be making me an adaptor to get to the standard 3" size.....
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09-20-2018, 06:09 PM
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#6
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,406
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Quote:
Originally Posted by BSAman
Problem is , the cap is 3-1/2 fitted diameter.......not 3" like every other rv that I've owned..
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OK then , missed that in your first post . 
Do you have a sewer hose adapter that works on the 3 1/2 " ?
What year is this RV?
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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09-20-2018, 06:44 PM
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#7
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Junior Member
Join Date: Aug 2018
Posts: 6
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2005 Gulfstream country club 40'.......
I've heard airstream and Gulfstream were the only two that used the 3-1/2""....
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09-20-2018, 06:48 PM
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#8
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,406
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Quote:
Originally Posted by BSAman
2005 Gulfstream country club 40'.......
I've heard airstream and Gulfstream were the only two that used the 3-1/2""....
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Probably to limit supply and control the price. 
EDIT: Could you post a picture of your set up , it might be that cutting the plastic pipe and gluing on an end that would be for the standard 3" cap, would be the best fix.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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09-21-2018, 10:42 AM
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#9
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Junior Member
Join Date: Aug 2018
Posts: 6
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I'm going to cut the present pipes off, make an adapter to use 3" hardware. .
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09-21-2018, 11:53 AM
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#10
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,406
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If there is an inch of straight pipe behind the existing connector , you may get away with one cut.
I saw a number of glue on connections, that used 3" caps while I was looking for the 3 1/2 " cap.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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09-21-2018, 01:02 PM
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#11
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,406
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Go to This site and check out their sewer connection/fittings section.
RV/Trailer, repair parts, then to plumbing
www.etrailer.com
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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