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OSI, 21.1 ounces, quad foam window & door installation foam, single component polyurethane, minimal expansion & low pressure, seals gaps, cracks, holes & voids around windows & doors, closed cell structure provides an r factor of 5 per inch, adheres to wood, concrete & drywall, compatible with asphalt & butyl flexible flashing, specifically designed for use with the osi quad window & door system.