Replacement Mulch Plug for Ryobi 40V 20" Lawn Mower Models RY401017VNM & RY401018VNM - 544164001

What It Is

This is an OEM replacement mulch plug (part #544164001) for Ryobi 40V 20-inch lawn mowers, specifically the RY401017VNM and RY401018VNM models. It blocks the side-discharge chute, forcing grass clippings to recirculate under the deck for finer mulching.

Fitment & Compatibility

• Deck size: 20 inches only. Will not fit 21-inch or other Ryobi models.
• Model match: Confirmed fit for RY401017VNM and RY401018VNM. Not compatible with RY401140, RY401150, or older 40V 20-inch mowers (check your model number on the deck sticker).
• OEM vs aftermarket: This is a genuine Ryobi part. Aftermarket plugs may be cheaper but often warp or fit loosely due to slight molding differences.
• Check before buying: Remove your old plug and verify the latch tabs and rubber seal shape match the photos. The plug must snap in firmly with no gaps.

Key Things to Know

• Installation difficulty: Easy – just lift the side chute flap, insert plug, and secure with the latch. No tools needed.
• Quality: OEM rubber holds up well to UV and heat. Aftermarket versions may crack after one season.
• Common gotcha: If your mower came with a bagging door, that door is not a mulch plug. You must remove the bagging door to install this plug.
• Usage tip: Mulching works best with dry, short grass (under 3 inches). Wet or tall grass will clump even with the plug in place.

Should You Buy It

If your original mulch plug is lost, cracked, or missing, this is the correct, hassle-free replacement. It’s priced fairly for OEM quality and installs in seconds. Buy it if you want consistent mulching without fiddling with aftermarket fitment issues. If your mower never had a plug (e.g., you’ve only used the bag), this adds mulching capability for $15.