deawater 1pcs 731-2363 Mulch Plug for CUB Cadet MTD 42" Troy Bilt Pony, Bronco and Colt Built Before the Year 2010 Replaces 7311643A, GW-7311643A

What It Is

This is a mulch plug (part 731-2363) that blocks the discharge chute on your lawn mower deck, forcing grass clippings to recirculate and cut into fine mulch. It’s designed for select 42-inch CUB Cadet, MTD, and Troy-Bilt riding mowers built before 2010.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch stamped steel deck (not fabricated) and was manufactured before 2010. This plug replaces OEM numbers 7311643A and GW-7311643A. It fits specific models like the Cub Cadet LT1042, LT1045, LT1050; Troy-Bilt Pony, Bronco, Colt; and MTD Yard Machines with 42" decks. Measure the chute opening—it should be roughly 8.5" wide. If your mower has a quick-attach bagging system, ensure the chute cover uses a single center latch (not side pins). This plug is not compatible with 46" or 54" decks, or any model built after 2009.

Key Things to Know

• Material & fit: Made of durable black plastic, but it’s a universal aftermarket part—fit can be slightly tight. You may need to file the edges for a snug seal.
• Installation difficulty: Easy—remove the discharge chute cover, slide the plug into the chute opening, and secure with the existing latch or a provided bolt. No tools required.
• Common gotcha: If your mower has a side-discharge deflector that’s bolted on, you’ll need to remove it first. The plug replaces that deflector entirely.
• Performance: Works well for mulching dry grass, but clogs easily with wet, tall grass. Use sharp blades and mow more frequently for best results.

Should You Buy It

If you have a pre-2010 42" CUB Cadet, MTD, or Troy-Bilt riding mower and want to convert from bagging/side-discharge to mulching, this $17.80 plug is a cost-effective, simple upgrade. It’s ideal for homeowners who mow weekly and prefer a clean, fertilized lawn without bagging. Avoid it if your deck is larger than 42" or your machine is a 2010+ model—fitment won’t work.