Oatey 39010 Sure-Vent Wall Box with Metal Grille Faceplate for 1-1/2", 2" or 3" adapters Can be used with any air admittance valve requiring a recessed installation Metal grille faceplate allows air movement to the Sure-Vent while the box offers protection and access to the Sure-Vent behind the drywall Grille is attached to the box using screws to the box frame Box has four mounting brackets to secure it to the studs AAV mounts inside the wall box to the DWV system via a 2" diameter molded-in drain port