Troy-Bilt Mulch Plug Assembly

This plug blocks the side discharge chute, forcing grass clippings to circulate under the mower deck. This allows the blades to cut the grass multiple times into fine pieces, which then fall back into the lawn to act as natural, nutrient-rich fertilizer.

This part is designed specifically for compatible Troy-Bilt models. To ensure a correct fit, check your mower's owner's manual or the sticker under the seat or on the deck to confirm your model number matches the manufacturer's compatibility list for part 631-05178.

Installation is straightforward and typically requires no tools. You simply lift the discharge chute cover, insert the plug into the opening, and secure it according to your mower's specific latching mechanism.

While you can mulch with standard blades, using dedicated mulching blades often provides a cleaner, more efficient cut. If you notice the grass isn't being chopped finely enough, consider upgrading to a mulching blade set.

Yes, you can leave it in permanently if you prefer to mulch every time you mow. However, if you need to switch back to side-discharging or bagging for taller, thicker grass, the plug is designed to be easily removed.