Set of 3 replacement primer bulbs designed to restore reliable engine starting for compatible snowblowers and small engines. Key benefits Restores proper fuel priming for easier cold starts and fewer pull starts. Replaces cracked or hardened bulbs to stop fuel leaks and fuel draw problems. Three bulbs in one pack provide spare parts for multiple machines or future repairs. Flexible, resilient material for repeated use and quick fuel chamber priming. Simple swapin replacement that reduces downtime and avoids visits. What it does Functions as the manual fuel primer for carbureted engines, pushing fuel into the carburetor for fast ignition. Fits the original mounting points and fuel lines on the compatible models listed below. Compatibility and part numbers Compatible with snowblower and small engine models that use part numbers 75110639, 570682, 321802A. Intended for use with Craftsman, TroyBilt, MTD, Ryobi, and Yardman machines that require these primer bulbs. Use the part numbers to confirm fit for your specific model before . Attributes Quantity: 3 primer bulbs per pack. Material: flexible rubber compound designed for fuel resistance and repeated use. Size: standard replacement size for the listed part numbers and compatible models. Performance: provides consistent primer action to accelerate starting and reduce choke time. Easy installation Direct replacement for worn factory bulbs; typically installs in minutes. No special tools required for most models. Remove old bulb, attach fuel lines if applicable, and secure bulb in place. Use scenarios End of summer tune up: brittle primer bulbs before cold weather to ensure your snowblower starts reliably when needed. Onthespot : Keep a spare bulb in your toolbox to quickly restore fuel priming after a bulb fails while clearing a driveway or path. Maintenance for multiple machines: One pack supplies replacements for several compatible machines in a household or fleet. What to check before buying Confirm the part numbers 75110639, 570682, 321802A match the part required by your machine. Inspect the mounting style and fuel line connection on your unit to ensure the standard replacement size is compatible. This set provides a practical, readytoinstall solution for restoring fuel priming on compatible snowblowers and small engines, reducing downtime and making seasonal starting more reliable.