For reliability, performance, flexibility and ease of installation and service in one compact control, Robertshaw's diaphragm/solenoid gas valves are the answer.These controls are single function, diaphragm types and are excellent replacements for solenoid gas valves. Models are available with or without a gas cock, and regulated and nonregulated models are available (see ordering chart). Standard features include: pilot outlet, pilot gas filter and pilot adjustment key. VALVES CAN BE MOUNTED IN ANY POSITION EXCEPT UPSIDE DOWN. Use 1751-003 to convert valves from L.P. Gas to Natural. Use 1751-013 to convert valves from Natural Gas to L.P.