Problem 1: The outside faucet on the house doesn't have a turn off/on knob anymore and it is stripped out so badley you can't even use a pliar to turn it on. How can I replace this.

Problem 2: Shortly after my dishwasher was installed the plumbing under the sink started falling apart. It is all Plastic piping and it doesn't stay connected at the joints. The piping is all a little off like some of the pieces are to long or to short just enough so that I can't get a good connection. How do I make them stay together.

Problem 3: The bathroom sink leaks under the cabinet. I have replaced the lines from the faucet to the wall but they aren't the problem. It is almost like the faucet is leaking but it is only 1 year old and recently started leaking and I am tired of emptying the bucket. Is it just a matter of replacing the faucet?