[Lifetime Warranty] 530047721 503936601 188-512 Primer Bulb - Pack of 6

6 Pcs 530047721 503936601 188-512 Primer Bulb

Key Features

• Package contains 6 primer bulbs.
• Snap-in design for direct replacement.
• Constructed from fuel-resistant polymer to prevent hardening and cracking.
• Dimensions: Approximately 1-5/16 in (height) x 7/8 in (outer diameter).
• For use with 2-cycle small engines to assist with cold starts.

Replaces / Cross-Reference Part Numbers

• 188-512
• 188-512-1
• 503936601
• 530047721
• 0057003
• 188-12-1

Compatibility & Fitment

• Fits Brands:PoulanRyobiEchoHomeliteBolensHusqvarna
• Fits Equipment:String TrimmersLeaf BlowersChainsawsBrush Cutters
• Fits Walbro Carburetor Models:WT-23AWYJ-33WYJ-34WYJ-45WYJ-92WYJ-94
• Select Confirmed Models:Poulan: PP136, PP136E, PP330, PPB100E, PPB150E, PPB200, PPB250E, PPB300E, PPB350Ryobi: BP42Husqvarna: K750, K760

When to Replace

• The existing bulb is cracked, brittle, or has turned opaque.
• The bulb does not return to its original shape after being pressed.
• Fuel is leaking from or around the primer bulb.
• The engine is difficult to start and fails to draw fuel.

Installation Tips

• Disconnect the spark plug wire for safety before performing service.
• Observe or photograph the fuel line connections before disassembly.
• Use small pliers to remove the retaining clip and old bulb.
• Clean the carburetor housing surface before installing the new bulb.
• Ensure the new bulb is fully seated to create a proper seal.
• Reconnect the fuel lines to the correct inlet and outlet ports.