I have a price pfister single handle tub/shower faucet. When I pull it out (to turn it on) the water starts to spout out the sides of the pull out handle thing. I noticed something black (maybe a seal?) fall off. How do I fix this? Can the part(s) be found at a home improvement store or will I need to order it? Also, in five years I have never been able to locate a main water shut-off valve (except for the one at the street) and please don't ask me to look in the crawl space! I'm guessing the water will have to be shut off to do this? Thanks so much in advance.