Round electrical hatch constructed not to fade or discolor due to weather or chemical action. Vermin door will accept a 30- or 50-amp cord. Door comes with a snap lock feature to keep it securely closed while traveling. Replaces any round hatch up to 4-1/2″. Cutout Dim: 3-1/2″. Outside Dim: 4-1/2″. Collar Depth: 2-3/8″.