Suppose that you have an acrylic box containing water inside, as well as a submersible water pump and tubing. Also assume that you have a viable source of energy to turn the pump on.
A really simple solution I devised years ago for an application my employer had to connect through a plastic container was to use silicone rubber hose and a short piece of nylon air hose over which the silicone rubber hose could be fitted. To use, simply drill a hole through the plastic container, and then push the end of a piece of tubing connected to the pump outlet, to extend say about 10mm. outside the container. Then you wet the short piece of nylon tube, and push it into the end of that hose, and that will make a watertight connection through the tank wall. Then you simply slip another piece of silicone tubing onto the projecting end of the nylon tube. Job done. Many thousands of products using this style of cheap through connection were made, and there were absolutely no failures. They are still going strong to this day. Using clear (natural) silicone rubber tubing, such as medical tubing or natural industrial grade is fine. We had problems when we changed to a white tubing at one stage, as the white disintegrated with time when used with water from some locations. The key to success IS the silicone tubing. Plastic tubing hardens with age, and could therefore leak eventually.
For the leakage I can suggest that you can use inflatable pipe plug to test if there is a leakage or not. This may help you fasten your work. I hope this helped you a little.
If it's a compression becoming it's going to have threads and a nut on it. When you purchased it there must had been a unfastened brass ferrule in below the nut. You slip the nut over the copper tubing, slide on the brass ferrule, after which tighten down the nut. Two words of warnings when utilizing compression fittings: fundamental!!! (1) do not overtighten the nut, and even more importantly, (2) if you start tightening the nut, you can't turn the nut the improper way (as if to loosen it) even very reasonably. ALL turning movement have got to be to tighten most effective. If you are making a mistake and even flip the wrench back 1/4 an inch which you can wreck the compression of the ferrule and the fitting will leak and no matter how tight you tighten it after that it is going to leak. At that factor you can have got to either reduce out the pipe or or else get rid of it and over.
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