Answer Hello Scott, If the parts from the original changeover were not retained, the parts will have to be ordered individually to change it back to natural gas. You would need one 00448637, one 00499754, one 00448636, one 00499753, and one 00603880. If the regulator has a flip-over stop under the cap, it will not have to be replaced but just flipped. Read More... Answered by AppliancePartsPros.com | Friday, August 30, 2013