731-09312 19A30013 Mulch Plug 30" Deck Compatible with Cub Cadet/MTD/Troy-Bilt/Craftsman Lawn Mower, Fits TB30R, CR30, R-105, R-110, R-140, R-1500

What It Is

This is a factory-style mulch plug for 30-inch cutting decks on Cub Cadet, MTD, Troy-Bilt, and Craftsman lawn tractors. It blocks the side-discharge chute so grass clippings recirculate and get chopped finer for mulching.

Fitment & Compatibility

Before buying, verify your mower’s deck size is exactly 30 inches (measure from blade tip to blade tip). This plug fits models TB30R, CR30, R-105, R-110, R-140, and R-1500, plus many MTD/Cub Cadet/Craftsman/Troy-Bilt units with the same deck. It’s an OEM replacement for part numbers 731-09312 and 19A30013. Check your mower’s model number (usually under the seat or on the frame) and confirm your deck has a side-discharge chute opening – not a rear bagger or mulching-only deck. The plug measures roughly 8 x 4 inches, so measure your chute opening to be safe.

Key Things to Know

• Installation is simple – no tools required. Just slide it into the chute opening until it clicks or snaps into place. Some models may need a retaining pin (check your deck).
• Quality is OEM-grade – thick, UV-resistant plastic that won’t warp or crack from sun and heat.
• Common gotcha: If your mower has a bagger, you must remove the bagger adapter plate before installing. Also, never run the plug with a bagger attached – it blocks airflow and can damage the deck.
• Mulching performance depends on sharp blades and mowing dry grass. Dull blades or wet clippings cause clumping even with the plug.

Should You Buy It

Buy this if you own a 30-inch deck Cub Cadet, MTD, Troy-Bilt, or Craftsman tractor listed above and want to convert from side-discharge to mulching without buying a full mulching kit. It’s a cheap, no-hassle upgrade for finer clippings and less bagging. Skip it if your deck already has a mulching plug or you prefer bagging.