This gasket is not needed and can be discarded. Lift the gasket from the back side and pull away for the subwoofer. This will release the gasket from the woofer. 2. Install the subwoofer into the speaker enclosure with four 1” screws (not supplied). Please note the screw positions in reference to the grille. 3. Install the grille over the subwoofer with the supplied four 1 %" screws. electronics Part# 3720039