Robertshaw 720-079 Universal Electronic Ignition Gas ValveThe 720 series valves (7200 iper) are designed for intermittent pilot ignition applications. The 720 iper series valve incorporates a manual valve, pilot valve, dual automatic valves (2), and a main gas pressure regulator. Uni kits are factory set at the 3. 5" w. C. For natural gas, but can be converted to l. P. By installing the regulator conversion kit included. The 720 series valves are designed for many residential applications such as central