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Sealant manufacturer American Polywater Corp.’s FST-250 sealant is a two-part, high-expansion “closed cell” foam that is superior to duct putty and aerosol canned foam.  Unlike putties and canned foams, the company says its foam seals out gases, holds up to 15 ft of water head pressure, and will not dry out or sag over time.  Aerosol canned foams are typically “open-cell” foams that take up volume designed for insulation, but can’t hold back water head pressure.  Polywater says its foam keeps water, sewer gases, and critters out of vaults, manholes, converter boxes, light boxes, and switchgear by effectively sealing conduit entrances.  FST is also effective for sealing the tops of riser poles to keep out squirrels.  The FST-250 kit contains enough material to seal up to five 2 in. ducts.

Polywater says its foam keeps out water, sewer gases, and critters.

American Polywater Corp. www.polywater.com

-watch an installation video for the sealant here