AMTHKNO 205206001 Replacement Mulch Plug (Metal Parts not Included) for Ryobi 20" RY401011, RY410110-Y, RY401012, RY401120-Y Cordless Mower and Sm-Art Trek RY40LM03, RY40LM30 Review

Quick Verdict

Neither mower wins overall because they are completely different products — one is a replacement part for a lawn mower, the other is a battery charger — so the choice depends entirely on whether you need a mulch plug or a battery maintainer.

Side-by-Side Comparison

Where Mower A (AMTHKNO Mulch Plug) Wins

1. Direct mower compatibility – If you own a Ryobi RY401011, RY410110-Y, RY401012, RY401120-Y, SM-Art Trek RY40LM03, or RY40LM30, this plug is a drop-in replacement for the missing or broken mulch plug that lets you finely chop grass clippings and return nutrients to the lawn.
2. Low cost for a specific fix – At $19.99, it’s an inexpensive solution compared to buying a whole new mower deck or OEM part (which can cost $30–50). It saves you from leaving clippings on the lawn un-mulched or having to bag them.
3. Simple, tool-free installation – The plug snaps into the mower’s discharge chute in seconds. No wiring, no batteries, no maintenance. If you already have the mower, this is a one-minute upgrade.

Where Mower B (NOCO GENIUS1 Charger) Wins

1. Versatility across equipment – This charger works on 6V and 12V lead-acid (AGM, gel, flooded) and lithium batteries. It can charge car batteries, lawn mower batteries, ATVs, motorcycles, and even marine batteries. It’s not limited to one mower brand.
2. Smart maintenance features – It automatically detects battery type, adjusts charge rate, and switches to float mode when full. It includes temperature compensation, overcharge protection, and a desulfation mode that can revive older batteries. This prevents battery damage and extends battery life.
3. Proven reliability and support – With 62,222 reviews and a 4.4-star rating, plus a 3-year warranty, this is a highly trusted product. The AMTHKNO plug has only 8 reviews and no stated warranty, making it a riskier purchase.

Which Should You Buy?

Buy Mower A (AMTHKNO Mulch Plug) if: You own one of the listed Ryobi 20" cordless mowers and your mulch plug is missing, broken, or you want to switch from bagging to mulching without buying a new mower. This is a cheap, direct fix for a specific problem.

Buy Mower B (NOCO GENIUS1 Charger) if: You need to maintain or revive batteries for any lawn equipment (mower, trimmer, blower), car, or motorcycle. This charger is ideal if you have multiple lead-acid or lithium batteries that sit idle over winter. It’s a smarter investment because it works across all your gear.

Buy neither if: You don’t own a compatible Ryobi mower and don’t need a battery charger. These are unrelated products — one solves a mower part issue, the other solves battery maintenance. Choose based on your immediate need.

Here is a head-to-head comparison of the AMTHKNO replacement mulch plug (Mower A) and the AR-PRO inner tube pack (Mower B).

Important Note: These are not both lawn mowers. Mower A is a replacement part (mulch plug) for Ryobi mowers, and Mower B is a set of inner tubes for mower wheels. They serve entirely different functions. This comparison will treat them as accessories for a lawn mower owner.

Quick Verdict

The AR-PRO inner tubes win for sheer utility and reliability, but only if you need to fix flat tires; the AMTHKNO mulch plug is the better choice if you own a compatible Ryobi mower and want to improve mulching performance.

Side-by-Side Comparison

Where AMTHKNO Wins

1. Direct Compatibility for Ryobi Owners: If you own a Ryobi RY401011, RY410110-Y, RY401012, RY401120-Y, SM-Art Trek RY40LM03, or RY40LM30, this plug is a guaranteed fit. It restores the mower’s ability to mulch leaves and grass clippings instead of bagging or side-discharging.
2. Improves Mulching Performance: Without a mulch plug, most Ryobi cordless mowers will leave clumps or require bagging. This cheap plastic part redirects clippings back into the blade for finer cutting, which is essential for lawn health and avoiding thatch buildup.
3. Low Cost for a Specific Fix: At $19.99, it’s cheaper than buying a new mower deck or a whole new mower. If your original plug broke or was lost, this is the most affordable way to restore full mulching capability.

Where AR-PRO Wins

1. Universal Problem Solver: Flat tires are the most common mechanical issue with lawn mowers (and tractors, golf carts, garden trailers). These tubes fit a huge range of 20-inch tires (20x8.00-8, 20x10.00-8, etc.). They work on push mowers, riding mowers, zero-turns, and more.
2. Exceptional Value and Reliability: At $24.79 for a 2-pack, you get two tubes. One spare tube in your garage means you can fix a flat in minutes instead of losing a whole mowing day. With 20,211 reviews and a 4.3-star rating, this is a proven, trusted product.
3. Heavy-Duty Construction: AR-PRO tubes are made from thicker rubber than many OEM tubes. The TR-4 straight valve stem is standard and durable. They resist punctures better than thin, cheap tubes and hold air longer.

Which Should You Buy?

Buy the AMTHKNO Mulch Plug if:

• You own one of the listed Ryobi 20” cordless mowers and your original mulch plug is missing, broken, or you bought the mower used without one.
• You primarily bag clippings but want to switch to mulching for a few mows to return nutrients to the lawn.
• You need a cheap, one-time fix to restore a specific feature of your mower.

Buy the AR-PRO Inner Tubes if:

• You have any mower, tractor, or garden cart with 20-inch tires (20x8.00-8 or 20x10.00-8) and have ever dealt with a flat tire. This is a proactive purchase that will save you time.
• You want a spare set of tubes on hand for emergencies. The 2-pack gives you one to install now and one to keep.
• You value proven reliability (20,000+ reviews) over a niche, mower-specific accessory.

Buy neither if:

• You don’t own a compatible Ryobi mower and you don’t have any flat tires or a need for spare tubes. In that case, you don’t need either product.