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Old 09-29-2011, 11:40 AM   #1
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1984 34.5' Airstream 345
Foothill Ranch , California
Join Date: Mar 2010
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Motorhome Freshwater tank and fittings.. Help!

My 1984 345 has a mishmash of fittings and pipe systems..
I have searched and read thru this section, but am still confused!

Here is what is going on...
The Original, underbed 80 Gallon Freshwater tank is long gone.... and a PO replaced it with a 15 gallon...
This is how it looked...

I was given a 70 Gallon tank.
It only has one threaded hole, and a screw-on inspection cap...

My plan is to keep the 15G tank and add the 70g in front of it.

The outside filler will connect only to the 15G, and the 15G will have the level probes in it, as there are none currently.
When travelling I can carry 15G in the smaller tank to save weight, yet have enough for flushing and light use. There will be a pipe and valve between the 15 and 70 tanks. When open, this will balance the levels between the two, giving me up to 85 gallons for Boondocking etc.

I did a test fit, and it looks good, but I had to flip the 15G tank 90deg on its side to line up the filler neck with the outside filler. I had to position the 70g pipe inlet facing the wall, so I can access the valve thru the streetside locker door.

Here is how it looks.

I need to repair/replace some of the fittings...
This is the mess of pipes and pump/filter I need to sort out..
And, yes, I need to replace this rear floor section too... but later!

Ok, now the questions!
1/ What should I use to replace the Original grey pipe sections, and the white stuff and flexible pipe?
2/ How do I connect the Original grey stuff to the new stuff?
3/ I will need to add a vent pipe to the 70g tank, and I assume it is Polyproplene, so can I drill or add a vent, or should I drill the large cap and add one there?
4/ How do I put the level probes in the 15G tank? Do I need fittings?
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