and Nordyne M7 and MG9 series furnaces

Always use the orifice size specified by the manufacturer's LP conversion kit

When performing routine teardowns or replacing a hot surface ignitor

Precision Airflow Detection: Provides accurate differential pressure readings to the control board to maintain safe firing sequences

York S1-9951-0961 Orifice and Nordyne M7 and MG9Ensuring proper combustion in York furnace LP conversion projects requires precise fuel delivery, which is exactly why the S1 9951 0961 is engineered with a specific . 096" drill size. This #41 gas orifice is a critical recovery component for York, Luxaire, and Coleman units when transitioning from natural gas to liquid propane. Unlike generic alternatives, this OEM replacement offers the exact threading and flow rate needed to maintain the correct