Plumbers Putty is a gooshy putty used by plumbers. You pack it around the seals and it fills the little spaces that can leak. It hardens over time and makes a good seal. It comes in little plastic tubs of a few ounces for the homeowner who doesn't need a lot. just roll it around in your hands to warm and soften it, mush (<------fancy technical term) it into place and tighten everything down. Any putty the gooshes (<-----"Nuther fancy technical term) you scrape off and then you're done.