My trailer came with a little spigot on the curbside of the trailer that was used for draining the fresh water tank. I've replaced several and never had much luck with them holding up. They always seem to crack around one of the rivets. In addition to that, I could never get the last one to stop dripping despite all my efforts - including the Vaseline trick that had always worked before. I replaced it in April and it was already starting to crack again. However, that wasn't my main reason for doing this modification.
There's been no access to the water tank unless I took my bed apart and even that was very limited. I never knew how much water I had on board. Draining the tank from that little spigot was extremely slow and not very effective. There was also dead space around the tank that could be put to better use. I thought about installing a larger tank, but a small tank keeps the weight down and has proven sufficient for one person.
My solution:
I removed the spigot and its drain line. I added an access door from the outside. Covered the bundle of plumbing/wiring with the carpet removed from cutting out the access door space. I shifted the tank back, which gave me an additional 6" or so.
By the way, a little research rendered some valuable information about a cutting blade for the Dremel that is made for cutting fiberglass. WOW! Sliced through it like melted butter. Way better than anything else that I've ever used. I was able to keep the carpet in place while I was cutting, which actually helped hold the piece of fiberglass so that it didn't splinter and/or fall toward the end.
I now have a wonderful compartment (apx 14 x 22) with easy access. I can always see how much water is in my tank AND it drains a lot faster and it doesn't drip!
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