731-07131 987-02516A Side Discharge Chute, Mulch Plug, Compatible with MTD | Replaces 731-07131/731-7131 and 987-02516A/987-02516; fits Troy-Bilt TB110 TB130 TB200 TB230 and Craftsman 21 in

What It Is

This is a two-piece set that includes a side discharge chute and a mulch plug for MTD-built walk-behind mowers. It lets you switch between bagging/side-discharge and mulching, and it’s designed for Troy-Bilt TB110, TB130, TB200, TB230, and Craftsman 21-inch mowers.

Fitment & Compatibility

• Check your deck size: This fits 21-inch stamped steel decks only. Measure your deck width before buying.
• Model & brand: Confirmed for Troy-Bilt TB110, TB130, TB200, TB230 series, and Craftsman 21-inch mowers with MTD-style mounting. Not compatible with Honda, Toro, or John Deere.
• OEM vs aftermarket: This is an aftermarket replacement for OEM part numbers 731-07131, 731-7131, 987-02516A, and 987-02516. Fitment is generally good, but some users report needing minor trimming on non-OEM decks.
• Mounting points: The chute uses spring-loaded clips; the plug slides into the rear discharge opening. Verify your deck has the same mounting tabs and a rear discharge opening.

Key Things to Know

• Quality: Most buyers say it’s a solid match to OEM for half the price. A few note the plastic feels slightly thinner but holds up fine for residential use.
• Installation: Tool-free—snaps on and off. For the mulch plug, make sure it’s fully seated and the lever locks. Takes 5 minutes.
• Common gotcha: The side chute may not stay locked on some decks if the spring clips are weak. If it pops off, bend the clips slightly inward for a tighter grip.
• Mulching tip: For proper mulching, keep your blade sharp and mow dry grass. The plug alone won’t improve cut quality without a mulching blade.

Should You Buy It

If you own a compatible Troy-Bilt or Craftsman 21-inch mower and need an affordable way to switch between discharge and mulching, this set is a good value. It’s especially useful if your original parts are cracked or missing. Skip it if you need a mulching-only plug or a chute for a different brand.