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Old 09-22-2019, 03:15 PM   #1
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Plastic fresh water tank - Filler boss

OK, the more I learn about plumbing the less I know.


So I've got these exciting new water tanks that come with the "industry standard filler boss". So... the big question is... what connects to this filler boss? All I have is about 2 in of non-thread plastic pipe, 1 1/4" O.D.


Did not find anything specific to my question, on AF or from general searching, except for this part:
https://www.rvpartscountry.com/Fill-...Straigh-thtml.
Which might look relevant kinda sorta



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Old 09-22-2019, 04:57 PM   #2
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https://en.wikipedia.org/wiki/Boss_(engineering)
^^from this website^^
"In engineering, a boss is a protruding feature on a work piece. A common use for a boss is to locate one object within a pocket or hole of another object. For instance, some motors use a precisely machined boss on the front face to locate it on the mating part. Like a process on a bone, bosses on castings can provide attachment points or bearing surfaces."

I learned this in high school, mechanical drafting class.

Screw a male threaded plumbing adapter into the boss' threads. Connect a tee to the existing cold water pipe. Place pipe with a valve between the new tee and the adapter. With this you can fill the tank when the trailer is connected to a water supply.
At one time this was an option on Airstream trailers.

Or,
If the threaded opening is large enough that it will receive the pipe for the external filler spout, you can go that direction.

Or,
You can use this threaded opening to create an air vent.
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Old 09-22-2019, 05:02 PM   #3
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Duh, this answers my question:
https://www.vintagetrailersupply.com...m?1=1&CartID=0


Use fill hose with clamp going to the boss on the fresh water tank.


Not as complicated as I originally hoped.
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Old 09-22-2019, 05:19 PM   #4
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Thank you Alan, really good ideas.


Unfortunately the boss is not threaded, and has an unusual O.D. of exactly 1 1/4", which doesn't map to any piping standard I've encountered yet. Of course all of plumbing confuses the heck out of me ; -)


But I just might have found something simple:
https://www.vintagetrailersupply.com...m?1=1&CartID=0
Clamp this hose on the boss and you're good to go. Found that by looking for a replacement cap for the filler neck, should've checked VTS first.
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Old 09-23-2019, 07:26 AM   #5
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You can also purchase a rubber boot with hose clamps at any big box store that will allow you to go from the boss to whatever size pipe or hose you prefer.
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Old 09-23-2019, 11:18 AM   #6
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Thank you kidjedi, that makes sense.
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Old 09-23-2019, 01:23 PM   #7
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Quote:
Originally Posted by 43687269734F View Post
Thank you Alan, really good ideas.


Unfortunately the boss is not threaded, and has an unusual O.D. of exactly 1 1/4", which doesn't map to any piping standard I've encountered yet. Of course all of plumbing confuses the heck out of me ; -)


But I just might have found something simple:
https://www.vintagetrailersupply.com...m?1=1&CartID=0
Clamp this hose on the boss and you're good to go. Found that by looking for a replacement cap for the filler neck, should've checked VTS first.
That should work just fine. I replaced the filler hose on my 34' a couple months ago, but mine was threaded. The threaded adapter was 1.25" OD to receive the filler tube.
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Old 09-23-2019, 01:33 PM   #8
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You will need 4 openings for pipes.
Near the top - water inlet from the filler.
Near the top - outlet for air vent/overflow to exterior
Near the bottom - water outlet connect to pump
Near the bottom - drain to exterior for winterizing

Is there a bung plug in your tank?
If the tank is above floor, that bung goes upward.
If the tank is below floor the bung goes down.
The bung needs to be accessible without removing the tank and plumbing.
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Old 09-24-2019, 02:21 PM   #9
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Quote:
Originally Posted by A W Warn View Post
You will need 4 openings for pipes.
Near the top - water inlet from the filler.
Near the top - outlet for air vent/overflow to exterior
Near the bottom - water outlet connect to pump
Near the bottom - drain to exterior for winterizing

Is there a bung plug in your tank?
If the tank is above floor, that bung goes upward.
If the tank is below floor the bung goes down.
The bung needs to be accessible without removing the tank and plumbing.

Yes! Four pipe connections , two on top and two on bottom, for maximum connectivity. Will check on the bung plug, thanks for the advice.
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