There are other skills plumbers need aside from being able to work with water. One of the most common things that a slow drain on is fixing water lines.
85. Know your IRPCS International Rules for Preventing Collisions at Sea and be aware of how you should approach water line repair or cross a traffic separation scheme TSS).
Leaks can occur anywhere in your reverse osmosis water filter system. If this ever occurs, check the source of the leak. It may be from the hoses, fittings and the valves. Most of the time, some kind of tightening might be necessary. So make sure to securely tighten the fittings. If this does not work, you may need to replace the filter itself, however that might take a bit more work.
Working on the gas lines is also a complex job that only a licensed plumber can handle because it is very dangerous. Small leaks can't always be detected by odor alone, but a licensed professional has the proper equipment that's needed to ensure that you don't have any leaks in the line.
Keep an eye on any leaks in and around the house. Inspect taps, pipes and your roof regularly. Watch for leaks and if you find them, get it water line repair as soon as possible.
68. Sea sickness: I always keep a bucket in the cockpit, much better that the sufferer is sick into a receptacle of sorts than tries to be sick over the side.
Plumbers can help keep small problems from becoming large problems. Do your homework before choosing a plumber and you can help to ensure that the job is done correctly and for a good competitive price.