The AA66 foam gasket kit is used with the GWN series gas platform housing. In some applications, the GWN is installed on a non-standard electrical box (e.g. weatherproof-style electrical box). In these applications, the GWN housing may not provide a proper seal against the box. To improve the fit, install the AA66 foam gasket between the housing and the box. The AA66 includes replacement screws to secure the GWN and gasket to the box.