Description
Overview:
The Walbro Primer Pump Bulb 20mm Diameter Base (approx. 0.79 inches) is a genuine replacement bulb for many small-engine carburettors. Made from a clear, flexible, fuel‐resistant elastomer, it withstands modern unleaded petrol blends and regular use. Pressing the bulb draws fuel through the carburettor, purges air from the lines, and helps engines start quickly after storage or refuelling. It is suitable for a wide range of handheld and walk‐behind machines, including lawnmowers, chainsaws, brushcutters/strimmers, hedge trimmers, blowers, tillers, and small generators using Walbro or Zama carburettors. If your existing bulb is cracked, hardened, or leaking, this like‐for‐like 20mm base bulb restores proper priming and reliable ignition. Genuine Walbro quality ensures the correct fit, dependable sealing, and long service life.
Key Features:
- Genuine Walbro part for assured compatibility and build quality
- 20mm (approx. 0.79 inches) base size to match primer bases specified for this bulb
- Clear, fuel‐resistant elastomer for durability with petrol and ethanol‐blended fuels
- Transparent dome lets you confirm fuel flow and spot air bubbles
- Restores fast cold starts and smooth running after refuelling or maintenance
- Simple replacement with a snug, secure fit on the correct primer base
- Suitable for many Walbro and Zama carburettors across common small engines
- Designed to resist cracking, shrinking, and collapse over time
- Light finger pressure operation, even in colder weather
- Helps reduce excessive pull‐starts, protecting starter cords and recoil mechanisms
Typical Applications:
Ideal for replacing worn primer bulbs during routine servicing of garden and construction equipment. Common on chainsaws used for felling and logging, brushcutters for site and verge work, lawnmowers and lawn tractors for grounds care, hedge trimmers, leaf blowers, and compact generators. Useful whenever an engine struggles to prime fuel, takes many pulls to start, or shows air in the fuel line.
Also known as:
Often referred to as a purge bulb, priming bulb, primer button, carburettor purge bulb, fuel primer cap, or carb primer dome. These names describe the same function: manually drawing fuel into the carburettor to remove air and aid starting.
Product Specifications
| L&S Part No. | 188-12-1 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Walbro |
| OEM No. | W188-12 |
| Unit of Sale | 1 |
| Size | 22mm base |
| Machine Type | Chainsaws, Mowers |
