The Walbro 188-518-1 is a genuine OEM Screw-in Primer Bulb Assembly. Unlike the “snap-in” models commonly found on trimmers, this version uses a plastic flange with two screw holes to secure it directly to the carburetor or engine housing. Key Product Details Purpose: Manually primes the carburetor with fuel for easier cold starts. Design: Screw-on type with two mounting holes and two fuel line connectors (inlet and outlet). Specifications: Outer Diameter (OD): 13/16 inch (approx. 21mm). Height: 1-1/8 inches (approx. 28mm). Center-to-Center Holes: 1-1/8 inches. Engine Compatibility: Fits Walbro WT-119C and WT-265 carburetors. Equipment Fitment: Primarily used on Poulan, Poulan…