Toro 51503 Bottom Zip Replacement Bag, White

What It Is

The Toro 51503 Bottom Zip Replacement Bag is a fabric grass collection bag designed for Toro walk-behind mowers with a side-discharge chute, intended for catching clippings during mulching or bagging operations.

Fitment & Compatibility

• Deck size: Fits 22-inch Toro mower decks only (not 21-inch or larger models).
• Model/brand: Compatible with select Toro Recycler and Super Recycler models (e.g., 20333, 20334, 20339, 20370, 20371). Check your mower’s model number on the deck or under the seat.
• OEM vs aftermarket: This is an OEM Toro part (part #51503), not a generic substitute. Aftermarket bags may differ in zipper quality or fabric thickness.
• Measurements: Bag dimensions: roughly 18 x 12 x 6 inches. Verify your existing bag’s attachment hooks and chute opening match—the bottom zip is for emptying, not for top-loading.
• What to check before buying: Confirm your mower’s model number (e.g., on the engine shroud or frame) and that your mower uses a side-discharge bag, not a rear-bagging system. If your current bag has a different part number (e.g., 51504 for 21-inch decks), this won’t fit.

Key Things to Know

• Quality: Fabric is durable but not heavy-duty—expected for a lightweight collection bag. Zipper is the weakest point; avoid overstuffing to prevent jams.
• Installation difficulty: Easy—slides onto the mower’s chute hooks and secures with a strap. No tools required. Takes under 2 minutes.
• Common gotchas: The bottom zip can leak fine debris if not fully closed. Empty frequently to avoid weight strain on the zipper. Not compatible with bagging kits that use a separate frame.
• Maintenance: Rinse with a hose after use and let dry completely to prevent mildew. Store off the ground to avoid rodent damage.

Should You Buy It

Buy this if you own a compatible Toro 22-inch Recycler mower and need a direct OEM replacement for a worn or torn original bag. It’s a solid budget option for light to medium use, but if you bag heavy, wet grass frequently, consider a reinforced aftermarket bag instead.