543958001 Side Discharge Chute Compatible with Ryobi & Hart 40V, 20" Cordless Mower RY401170 RY401180RY401018VNM RY401017VNM HLPM04VNM HLPM05VNM

What It Is

This is a side discharge chute (part #543958001) for Ryobi and Hart 40V cordless mowers with a 20-inch cutting deck. It directs grass clippings out the side of the mower during non-mulching, non-bagging operation.

Fitment & Compatibility

Before buying, verify your mower deck size is exactly 20 inches—this chute will not fit 21" or 18" decks. Compatible models include: Ryobi RY401170, RY401180, RY401018VNM, RY401017VNM, and Hart HLPM04VNM, HLPM05VNM. This is an aftermarket part, not OEM Ryobi, but uses the same mounting points. Check that your mower has a side discharge port (not all 40V models do—some are rear-bag only). Measure the chute opening width (approx. 6.5") and compare to your deck port. If your mower is a different 40V Ryobi model not listed, it likely won’t fit.

Key Things to Know

• Material: This is a plastic chute—lighter than OEM but may be slightly less rigid. It flexes under heavy wet grass, which can cause clogging.
• Installation: Tool-free clip-on design. Takes under 30 seconds. Make sure the spring clips fully engage with the deck tabs—loose chutes can fall off mid-mow.
• Common gotcha: Some users report the chute does not sit flush, leaving a small gap that allows clippings to spray upward. Check alignment before each use.
• Durability: Plastic can crack if you hit a rock or curb. No reinforcement ribs like some OEM parts. Consider a metal-reinforced version if you mow rough terrain.

Should You Buy It

If you own one of the listed Ryobi or Hart 20" 40V mowers and need a replacement or backup side discharge chute for occasional use, this is a cheap, functional option. It’s not as durable as OEM, so skip it if you mow thick, wet grass frequently or want a long-term part. For light-duty, open-lawn mowing, it works fine.