This Burnham Commercial Field Modification Kit is designed for use with natural gas (NAT GAS). The kit, produced in 2013, includes all necessary components for modifying a variety of commercial-grade heating systems to function with NAT GAS. It is intended to provide an efficient and reliable solution for users seeking to switch their fuel source from propane or other gases to NAT GAS. The kit's components are made from durable materials that can withstand the rigors of commercial usage. The 2013 Field Modification Kit is compatible with specific models of Burnham Commercial heating systems, ensuring a seamless integration and operation.