Applying all-in-one glue to PVC pipe - ungvar/Shutterstock Don't ask this at Home Depot: "I need to glue pipes together. Do you have that stuff that comes in metal cans with a little applicator?" The ...

One of the big "secrets" in plumbing seems perfectly obvious once you finally realize it: The pipes don't fit together for a reason. This applies to a lot of plumbing fittings, and of course, it ...