Poweka New Pack of 5 Replace Primer Bulb Bulbs Pump Compatible with Ryobi Craftsman Homelite P/n 561635001 Zama 0057003 0057004 Echo 12538108660

What It Is

This is a 5-pack of aftermarket primer bulbs designed to replace the rubber bulb on small-engine carburetors (typically Zama or Walbro). They’re used on string trimmers, leaf blowers, chainsaws, and lawn mowers that use a primer bulb to pull fuel into the carburetor for cold starts.

Fitment & Compatibility

Check your equipment’s brand and model number before buying. These bulbs are marketed to fit Ryobi, Craftsman, Homelite, and Echo machines, but they also work on many other brands using the same Zama or Walbro carburetor. The OEM part numbers listed are: 561635001 (Ryobi/Craftsman), 0057003 and 0057004 (Zama), and 12538108660 (Echo). The bulb diameter is approximately 1.1 inches (28 mm) – measure your old bulb’s outer diameter and stem length to confirm. If your carburetor uses a different size (e.g., smaller 0.9-inch bulbs), these won’t fit. No deck-size or engine-displacement requirements; compatibility is purely carburetor-based.

Key Things to Know

• Quality: These are aftermarket bulbs, not OEM. Some users report they’re slightly stiffer than originals but work fine. Expect them to last 1-2 seasons with regular use.
• Installation: Easy – pop off the old bulb (may need a small flathead screwdriver), push the new one in until it seats. No tools required unless the retainer ring is stubborn.
• Common gotcha: The bulb must sit flush and seal completely. If it’s loose or bulging, fuel won’t prime. Check that the stem goes fully into the carburetor’s check valve.
• Pack of 5: Good for multiple machines or spares, but you only need one at a time. Store extras in a cool, dry place to prevent premature hardening.

Should You Buy It

Buy this if you have a Ryobi, Craftsman, Homelite, or Echo small engine (trimmer, blower, chainsaw) with a failing primer bulb and want a cheap, quick fix. It’s ideal for DIYers who can confirm fitment by measuring their old bulb. Skip it if you need OEM-specific parts for a warranty repair or if your carburetor uses a non-standard bulb size.