Replacing the copper w/ Pex and ran into a questionable issue. It appears that the water line and gas line intersect in a "T". Coming from HW heater to the gas line to the water line. Is this an unusual setup? Anything you would change ? Thanks.
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There is no way the gas and water lines will ever connect to one another. The water lines on a hot water heater come off the back of the heater while the gas line will connect to the front, accessible from the outside of the trailer at the heater door.
If you are replacing water line with Pex that is fine but do not replace the gas line with anything other than copper. You can use flexible copper line to replace the older hard copper but that is the limit when it comes to copper.
Study the lines shown in your picture some more. Not sure where that Tee goes but it is not to the gas.
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Looking at the last pic, the line coming down into the Tee are both gas. There is a flex product for gas lines but i would stay with the copper. Copper is tuffer, and it appears on the pic with the gas line they used flexible (soft) copper line to help route it. It most likely feeds from the rigid copper (the Tee line)
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It's difficult for me to tell what is what from your pictures, but the gas and water should never cross.
The gas lines should run under the trailer and go up through the floor directly to the device they are attached to. You should see a shutoff valve under the trailer for most or all of the gas devices. It should be fairly simple to follow these where they come through the floor.
The water lines should all be above the floor except where they attach to the city water connector, the water tank and any drain lines.
Here is a diagram from the 72 Service Manual that may help - our 71 was the same except the outside water faucet was added at a later date. So you may or may not have part 14 and 28 and the line leading to it.
The water heater when back together should look something like this, if you use the flex lines and install the bypass kit.
The gas line I think would go in up front, with the fitting actually accessible only from outside the trailer. That looks like a cold water line. All gas lines would be under the trailer, below the belly pan. I'm sure some looking at there and you'll see where the gas line comes up through the floor and into the water heater. That big loop in the rear would be where the water regulator was stock, has been removed, so thats why the loop. That loop also looks to tie into the low point drain (red handled valve by the black tank valve).
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