Polywater® FST™ MINI is an expanding, quick-setting, closed cell foam, which is injected into a conduit to provide a watertight seal. The seal is superior to pliable duct putties and open cell aerosol canned foams. Polywater® FST™ MINI comes in a kit that contains side-by-side cartridges filled with the two part foam base. The two resins are mixed in equal parts as they are pushed through the mixing nozzle. Once injected, the foam expands and hardens, keeping water, acids, greases, gases, insects and rodents, etc, out of the conduit. The foam has good wetting and adhesion to metals, plastics and concrete. A special ratchet tool is used to inject the foam from the side-by-side cartridges.