Secure Access Doors for Fire Pits HPC Fire Recessed Mount Stainless Steel Access Door , 8×8 Inch 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 8.375″ x 8.375″ x 2″ and features an integrated lock to keep the contents secure within.