Secure Access Doors for Fire Pits The Recessed Mount Stainless Steel Access Door , 6×6 Inch by Hearth Products Controls provides secure access for several applications.  HPC has designed this access door to be recessed and provide access to the gas valve or controls for a gas fire pit to keep them out of normal reach.  The access door is designed to fit an opening size of 6.375″ x 6.375″ x 2″ and features an integrated lock to keep the contents secure within.