Uniflasy Weber Genesis II 300-Series Grill Parts Kit — E-310/S-310 Fit, 5 Porcelain Flavorizer Bars & 2 Cast-Iron Grates

Replacement set of five porcelain-enameled flavorizer bars and two heavy-duty cast-iron cooking grates built to restore performance on Weber Genesis II 300-series GS4 grills.

If your Genesis II E-310, S-310 or other 300-series Weber grill parts are showing rust, uneven heat, or flare-ups, this Uniflasy kit supplies the main wear items that most affect cooking quality. The package replaces the cast-iron grates and the porcelain-coated flavorizer bars found on many 2017-and-newer Weber Genesis II and Genesis II LX models, matching the fit and layout those grills require.

Will these parts fit my Weber Genesis II E-310 or 300-series GS4 grill?

Yes — the kit is designed for the 300-series Genesis II lineup (models produced 2017 and later). It aligns with common OEM mounting points and replaces several original part numbers used across the series.

• Compatible with E-310, S-310, E-315, E-325, E-330, S-335, S-345 and similar 300-series models.
• Matches original grate dimensions and flavorizer bar spacing for proper burner coverage.
• Works as a direct replacement for part numbers used across Genesis II grills.

How do the cast-iron grates affect cooking results?

The heavy cast-iron grates in this set hold and transfer heat efficiently, producing distinct sear marks and stable surface temperature for consistent grilling. Cast iron also smooths out hot spots so food cooks more evenly across the whole grate.

• Superior heat retention for better searing and caramelization.
• Even heat distribution to reduce cold patches on the cooking surface.
• Durable construction for long-term use when properly maintained and seasoned.

What do the porcelain-enameled flavorizer bars do, and why replace them?

Flavorizer bars shield the burners from drippings while vaporizing grease to add smoke flavor and help manage flare-ups. Over time the coating chips and rusts, which reduces their ability to protect burners and distribute heat evenly.

• Porcelain coating resists corrosion and limits direct flame contact.
• Vaporizes drippings to boost grilled flavor and reduce grease fires.
• Evenly disperses heat to maintain consistent cooking across burners.

How should I maintain these replacement parts for best life?

Routine cleaning and periodic seasoning keep cast-iron grates performing and prevent porcelain chipping on flavorizer bars. After each cooking session remove food debris and reapply a light coat of oil to the grates to prevent rust.

• Brush grates after use and re-season with high-smoke-point oil when cool.
• Wipe flavorizer bars clean of heavy residue; replace if coating is extensively damaged.
• Store the grill covered in damp or coastal climates to limit corrosion.

Who this is for: This Uniflasy replacement kit is aimed at owners of Weber Genesis II 300-series GS4 grills who want to restore reliable heat, reduce flare-ups, and extend the life of their appliance without searching for multiple individual parts. It's also a practical choice for anyone replacing worn OEM grates and flavorizer bars to return the grill to near-original performance.