Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Join Truck Conversion Today
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
 
Old 07-09-2013, 04:16 PM   #1
Senior Member
 
Join Date: Sep 2012
Posts: 135
Default Fittings for potable water tank

What are the typical fittings installed on the potable water tank?

I figure I need three fittings, a fill, an overflow, and a drain. Are 3/4" NPT typical, or something different. Any other fittings I should consider? Anyway, this is the tank I am planning on purchasing:

135 Gallon Rv Water Tank - RVB407

. . . and advice would be welcome. Anyway, I figure the pump is connected to the drain fitting on the bottom, and an overflow fitting (possibly two, one to each side of the truck), plus a third fitting for filling the tank via a water hose.

Thoughts?
__________________

jbeech is offline   Reply With Quote
Old 07-09-2013, 07:18 PM   #2
Senior Member
 
bushpilot's Avatar
 
Join Date: Jul 2011
Location: Tomball
Posts: 1,414
Default

this might help give you some ideas of the plumbing / fitting sizes -

RV Gravity Water Fill Hatch from PPL - PPL Motor Homes
__________________

__________________
Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw - Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over
bushpilot is offline   Reply With Quote
Old 07-09-2013, 11:17 PM   #3
Senior Member
 
Join Date: Jan 2011
Posts: 527
Default

The tank on my trailer is probably far from a "standard" installation, but may be helpful. The service fitting to withdraw water comes directly out the bottom so no water can be trapped in the bottom when you drain it. I don't remember if it 1/2" or "3/4" female pipe, but it doesn't really matter, all I did was use a fitting to adapt from the threaded fitting down to 1/2" pvc anyway. I suppose it is easier to reduce it down than have it too small, so err on the big side. I used the schedule 40 pvc pipe, which they tell me you're really not supposed to use for drinking water, as I figured it is heavier and would be less likely to crack and we really only use the water for the sink and toilet anyway.

The fill is just a hose barb the same size as the hose barb on the fill door like what Don suggests, I have the same setup. I would suggest buying your fill door first, and match that fitting to the one you are going to have installed in the tank.

The the city water connection on the fill door just plumbs into your water system downstream of the demand pump, no big deal there. I would put the city water connection in while you are doing the system, whether you think you will use it right now or not. I didn't the first time, then when we decided to stay in campgrounds from time to time I had to go back and buy a new filler door and redo everything. Way easier to do it right up front.

And there is a smaller hose barb built into the tank along side the filler, again the same size as the hose barb for the overflow on the filler door. Just match that up as well. The overflow also serves as a vent.
hot rod is offline   Reply With Quote
Old 07-10-2013, 02:57 PM   #4
Senior Member
 
Bob86ZZ4's Avatar
 
Join Date: Feb 2009
Location: St. Paul, MN
Posts: 1,819
Default

I think you also want to put a one way valve on the out line from the tank. That way/in you hook up to city water it won't allow water to push back into the tank. That's how mine was set up. They also put a t-fitting in the out line from the tank. That t then has a shut off valve on it and leads down through the floor toward the pavement. Works great when I want to drain out the tank.
__________________
'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
Bob86ZZ4 is offline   Reply With Quote
Old 07-11-2013, 02:26 PM   #5
Senior Member
 
Join Date: Sep 2012
Posts: 135
Default

Are the fittings molded-in, or are they a bulkhead type fitting? E.g. bore a hole, clean the flashing, and screw the pieces together with a gasket in between.
jbeech is offline   Reply With Quote
Old 07-11-2013, 06:07 PM   #6
Senior Member
 
Doc Weaver's Avatar
 
Join Date: Jun 2008
Location: West Chester, Ohio
Posts: 483
Default

I'm busy on a out of town gig, but I wanted to add to vent it well. Mine is not and it takes forever to fill because of the trapped air trying to bubble back through the hose. I like Bobs idea. I may have to change mine over to like his.
__________________
Doc Weaver '98 Freightliner FL60 pseudo toy hauler
Doc Weaver is offline   Reply With Quote
Old 07-12-2013, 11:18 AM   #7
Senior Member
 
Join Date: Jan 2011
Posts: 527
Default

The fittings on my tank are bonded. To use a bulkhead fitting you'd need some sort of opening to reach in and hold the backside to tighten it together. But I did see a port like that on the website that jbeech referenced above if you wanted to go that way.
__________________

hot rod is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 04:42 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
×