Product review (5 stars): A very easy part to replace.
Sometimes a coin gets stuck in these things. When that happens, it knocks around inside the white part until it breaks a hole in it and you have a leak on your hands. You can often repair the hole, but these are cheap enough that you may just opt to replace it. Instructions are on YouTube and it takes about thirty minutes. Most of that time is being careful turning the machine on it's side and telling your spouse, "Go away, I know what I'm doing.".