The GT044 AIR BLOCK® cable housing is a smart square style 2 part gasket sealed grommet. The GT044 "clicks" together encasing cables in its 2" x 2" flame retardant die cut foam cushion. The grommet fits a 4" x 4" floor panel opening with two quick action locking clamps that hold the unit firmly in place (without the need for additional drilling and screw fixing.)