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Old 05-18-2017, 09:29 AM   #1
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Alternatives to PVC for drains?

I have a question. Is there an alternative to PVC pipe from the drains on the sinks and tub to the gray water tank other than PVC?

The issue I have is our kithcen sink is on the other side of the bus from the tub. So no matter which side i place my grey water tank I have the challenge of getting the plumbing to the tank by going past the frame of the bus. Is there a different method?
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Old 05-18-2017, 09:38 AM   #2
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Having plumbing on both sides of a bus always presents this issue which is why nearly all skoolies (and most factory RV's for that matter) keep it all on the driver side.

You can use flexible lines (basically, hose of some sort) but you will almost certainly need a pump to get it where you want. Works best if the long run is limited to gray water. About the only other option I am aware of is to install separate "dumps" on each side. Very inconvenient but it has been done.
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Old 05-18-2017, 12:31 PM   #3
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I cut a section of floor and ran the shower drain over the frame
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Old 05-18-2017, 04:57 PM   #4
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You can still run PVC through the floor and across to the frame and use a piece of heavy grade tubing like spa/hot tub hose,or even a piece of radiator hose to cross the frame.
You will want to it the hole in the floor on the sink side big enough to pull that elbow up tight to the floor so you can give the rest of it as much grade/slope as you can.
Try to leave the section of tubing exposed underneath cause if/when you start having clogging issues besides the p-trap that will be the most likely spots.
And with such little grade side to side you will have to make sure to park level or a little tilt to the tank.
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Old 05-18-2017, 05:08 PM   #5
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You can also run the drain out of op per.
Copper has a smaller outside diameter than PVC.
A lot of older houses still use 1-1/4" drain lines for sinks and lavatories instead of the 1-1/2" that's standard now.
You can still get all of the smaller drain fittings almost anywhere.
Not a big difference but for running plumbing on grade you gotta get what you can.
Example
1-1/2" copper is 1-5/8" OD
1-1/2" PVC is 1-3/4" OD
1-1/4" PVC is 1-1/2" OD
1-1/4" copper is 1-3/8" OD
Normal plumbing drain slope is 1/8" per foot minimum
1/4" is good
Anything over 3/8" in a horizontal run starts causing problems because the water will out run the solids and leave them sitting in the pipe.
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