【Upgraded 91537】91537 Main Burner Gas Control Knob is made of heat-resistant materials as a whole,Not easy to melt and stick.The knob is overall gray in color, and the white heat indicator helps you accurately control the size of the grill heat. The special spraying process is not easy to fall off.The hand-held part adopts notch design, which is convenient to hold and more anti-slip 【Compatible Model】91537 control knobs is compatible with the Weber genesis summit 420/620 Series Gas Grills.Specific compatible models can be found on the lower details page 【Knob specifications】91537 control knobs fits manifolds with new valves, manifold shaft diameter is 1/4 inch. The specific dimensions of the knob are as follows: Knob body diameter: 2-3/8 inches Height of knob body: 1.77 inches D-shaped mouth diameter: 5/16 inches In addition to appearance, you can tell if our 91537 knobs will fit your grill by measuring the diameter of the grill manifold and comparing the diameter of the knobs' D-ports for consistency 【About Installation】The installation of 91537 Main Burner Control Knobs Knob is convenient and fast. You only need to remove the old knob and then place our new 91537 knob in its original position in the correct D-shaped direction(it is recommended to align it and install it to avoid damaging the D-port and causing the knob to loosen). After installation, you can try turning the switch several times to check if it is installed properly and if the knob has good compatibility with your grill 【Worry Free Selection】Our 91537 knobs has excellent quality and adaptability, and we are confident in it. If there are any problems during use,We will quickly solve your problem within 12 hours (Solve all product problems within two years).You can choose us with confidence Main Burner Gas Control Knob,Summit Main Burner Gas Control Knob,91537,91537 knobs,91537 control knobs, summit grill knobs 91537,knob 91537, summit 420 replacement knobs,summit 420 knobs, summit 620 grill knobs,grill control knob,grill knobs replacement, gas grill knob,grill knobs, burner control knobs, main burner control knobs,grill replacement knobs