Includes (2) Main burner control knobs (gray) These fit the manifold that was redesigned with new valves in 2012. Fits the following Weber Summit models: 97121001 (2012) (LP) Summit E-420 Grill - Black 97221001 (2012) (NG) Summit E-420 Grill - Black 97120001 (2012) (LP) Summit S-420 Grill - SS 97220001 (2012) (NG) Summit S-420 Grill - SS 1740001 (2007) Summit S-450 Gas Grill 97320001 (2012) (LP) Summit S-620 Grill - SS 7320001 (2010-2011) (LP) Summit S-620 Grill - SS 7321001 (2010-2011) (LP) Summit E-620 Grill - Black 97321001 (2012) (LP) Summit E-620 Grill - Black 97420001 (2012) (NG) Summit S-620 Grill - SS 97421001 (2012) (NG) Summit E-620 Grill - Black