91538 Knob: Compatible with Weber Summit 400/600 series grills (2012 and Later)—including E-470, S-470, E-670, S-670, S-460, S-660, and Grill Center models.Specific models are listed on the details page. Crafted from sturdy ABS plastic with reinforced internal structure to provide lasting performance through regular grilling seasons. Does NOT fit 2007-2011 (use 70867) or Genesis/Spirit series—please verify your grill before making your selection Installation Tip Included: Oil and impurities on the valve stem can be cleaned in advance.Apply liquid soap to the valve stem before pressing—avoids the tight-fit breakage that occurs with dry installation. The precision 5/16" D-shaft design slides on smoothly without forcing, Effectively avoids “broke during install”.No tools required Precision Control: Concave grip with 8 notched finger holds provides confident turning even with greasy hands. Precision-molded "Off/Ignition/High to Low" graphics won't fade. The 2-3/8" diameter and upgraded bearing material ensure wobble-free working for accurate temperature control—no more guessing between MEDIUM and HIGH Note: Features translucent skirt that conducts light from your grill's built-in LED system (grill hardware required). Knob contains NO batteries or electronics—it simply glows when your grill's light system is activated. If your grill lacks factory lighting, these function as standard knobs without illumination Worry-free Choice:91538 grill control knobs include 2 knobs. 400 series needs 4 main knobs (need 2 sets); 600 series needs 6 main knobs (need 3 sets). You may choose to replace all knobs on the grill (not just the cracked or damaged ones) to maintain visual consistency across the entire unit. If there is any problem with the knob of the 91538 knobs, we will quickly solve your problem within 12 hours (Solve all product problems within two years) 91538 lighted control knobs compatible with Weber Summit 400/600 grills 2012 and later Compatible with Weber:2880001 291001 291101 292101 293001 293101 294001 294101 297001 297101 298001 298101 7160001 7170001 7171001 7260001 7270001 7271001 7292001 7292101 7360001 7370001 7460001 7470001 77460001 77470001 77471001 77160001 77170001 77171001 77260001 77270001 77271001 77360001 77370001 77371001 9291001 9291101 9292001 9292101 9293001 9293101 9294001 9294101 97160001 97170001 97171001 97260001 97270001 97271001 97360001 97370001 97371001 97460001 97470001 97471001 E-470 E-670 GRILL CENTER GRILL CENTER L GRILL CENTER S S-460 S-470 S-660 S-670 etc.