Weber Summit replacement control knobs set of 2 — OEM #70377, D‑stem 2.5" diameter, fits 2007–2010 models

These are genuine Weber replacement control knobs (part #70377), a set of two designed to fit Summit gas grills from model years 2007 through 2010.

If your Summit grill knobs are cracked, faded, or spinning without engaging the valve, swapping in an OEM set restores reliable control and a factory-fresh look. This pair of knobs measures about 2-1/2 inches in diameter, uses a D-shaped stem insert for secure alignment, and is specified for a long list of Summit S/E 420–650 models across 2007–2010 production years.

Which Summit models will these knobs fit?

These replacement knobs are engineered to match Summit series grills built between 2007 and 2010, covering both S and E configurations and multiple burner sizes. They are intended as direct OEM replacements when the original knobs share the same D-hole stem pattern.

• Compatible with Summit S-420, E-420, S/E-450, S-440 built-in, S/E-620 and S/E-650 variants listed by Weber.
• Includes specific fitment for 2007–2010 Weber part numbers (see product listing for exact model codes).
• Designed for both natural gas (NG) and liquid propane (LP) Summit variants that use the D-hole stem.

How easy is it to install these Weber knobs?

Installation is straightforward and requires no special tools for most users: pull the old knob straight off the control stem and push the new Weber knob onto the D-shaped shaft until it seats. If the existing stem is damaged, you may need to inspect the valve or consult a technician before reusing the new knob.

• Tool-free swap: pull off the old knob, align the D-hole, and press the replacement on.
• Proper fit relies on intact D-shaped stem; damaged stems need valve repair or replacement.
• Two-knob set lets you replace both ends of a multi-knob control bank for a matched appearance.

What are the physical and material details of the knobs?

Each knob is approximately 2-1/2 inches in diameter to match the ergonomics and spacing of Summit control panels. They are manufactured to Weber OEM specifications for consistent fit, rotation, and temperature tolerance typical of regular grilling use.

• Diameter: about 2-1/2" to match original Summit control layout.
• Stem interface: D-hole insert for secure, non-rotating engagement with the valve shaft.
• Genuine Weber OEM part number 70377, ensuring original appearance and performance.

Will these replacements change grill operation or safety?

These knobs are cosmetic and functional replacements only — they do not alter burner output, regulator function, or safety systems. Using genuine Weber parts helps maintain proper control feel and avoids loose-fitting aftermarket knobs that can slip or misalign.

• OEM design maintains intended control travel and click points where applicable.
• Replaces worn or broken knobs to reduce accidental valve movement and improve user control.
• Does not replace internal valves or safety devices; inspect those components separately.

Who is this for: Grill owners who have a Weber Summit from the 2007–2010 model years and need a reliable, factory-compatible pair of control knobs—whether to replace faded or cracked knobs, to restore a matched control bank appearance, or to return a grill to OEM condition before resale. If you are unsure about fit, compare your control stem to the D-shaped insert specification or check your grill's model number against the compatibility list in the product details.