188-12-1 0057003 0057004 Primer Bulb Pump Bulbs for Sthil 41331212700 Homelite 01201 UP04802 Echo 12318140630 and Homelite Echo Stihl Robi Zama Primer Pouland 561635001 A01195A

What It Is

This is a universal replacement primer bulb for small engines, used to pump fuel into the carburetor for easier starting. It fits many handheld outdoor power tools like trimmers, blowers, chainsaws, and edgers.

Fitment & Compatibility

Before buying, check your current bulb’s shape (round or oval), hose barb diameter (typically 3/16" or 1/4"), and number of ports (usually 2). It replaces OEM part numbers for Stihl (4133 121 2700), Homelite (01201, UP04802), Echo (12318140630), Poulan (561635001, A01195A), and Zama/Robi carburetors. Measure the bulb’s outside diameter (approx. 0.5"–0.6") and the hose nipple size—if yours differs, you’ll need an adapter or a different bulb. Not for large riding mowers or zero-turns.

Key Things to Know

• Installation is easy—just pull off the old bulb, push on the new one. No tools needed, but be gentle to avoid tearing the rubber.
• Quality varies—this aftermarket bulb is soft and pliable, but some users report it’s slightly stiffer than OEM. It should work fine for most uses.
• Common gotcha: If the bulb doesn’t snap back after pressing, the fuel line or check valve may be clogged—replace the line too.
• Check orientation—some bulbs have a small arrow or flat side indicating fuel flow direction. Install it the same way as the old one.

Should You Buy It

If you have a Stihl, Echo, Homelite, or Poulan handheld tool with a failing primer bulb, this is a cheap, easy fix. It fits most common small-engine carburetors and saves you from buying a whole carburetor assembly. Just confirm your bulb’s size and port count before ordering.