ROFLEX pipe grommets provide a quick, permanent seal around duct and pipe penetrations through airtightness and weather-resistive membranes. Manufactured from highly flexible EPDM, the grommet stretches around the pipe while maintaining an airtight, windtight and watertight connection, even if the pipe is moved during installation. Suitable for interior and exterior use, ROFLEX can be taped to the surrounding membrane to create a durable building-envelope junction across a wide range of pipe diameters.