These caps only fit Big Green Egg's Large and XL grills. 

Benefits & Advantages:

• Fits BGE sizes Large & XL
• Smokeware says it fits the Medium. It can be a very loose fit as the inside diameter of the Cap is approximately 5-1/2 inches. Measure your egg's vent stack before buying for a medium Egg®.
• New tapered vent design for precise low temperature control.
• New laser etched Smokeware Logo
• Fits securely on Large and XL. Will not fall off or break
• Maintains vent settings when grill is opened and closed
• Will not rust. Cook in rain or snow, all weather cap
• Stainless steel 304 Grade replaces daisy wheel & porcelain cap