2piece replacement primer bulb set compatible with Tecumseh 640351 for lawn and garden equipment Why you need this primer bulb Restores priming function when the original bulb is cracked, hardened, or missing, making cold starts easier. Comes as a pair so you have a direct replacement plus a spare for future maintenance. Designed for straightforward, timesaving installation so you can equipment to service quickly. Key features and attributes Compatibility: Direct replacement for model 640351 used on many small engines and outdoor power equipment. Function: Manually primes the carburetor to help establish proper fuel flow before starting. Quantity and fit: Includes 2 primer bulbs sized to match the standard fit for equipment that uses the 640351 part. Material and durability: Made from flexible, fuelresistant rubber material to withstand routine use and exposure to gasoline. Performance: Helps reduce hard starting and improves firststart reliability when installed as a proper replacement. Simple installation Remove the old, worn bulb from the carburetor housing. Press the bulb into place until it seats firmly. No special tools required in most installations. Use scenarios a cracked primer bulb on a walkbehind lawn mower to restore easy starting after winter storage. Keep a spare bulb in your tool kit for emergency field repairs on a tiller or other small engine powered garden machine that uses part 640351. During routine seasonal maintenance, swap in a bulb to ensure reliable priming and reduce startup problems. What to expect A straightforward, compatible replacement that restores the intended priming function for equipment using the 640351 part. Two bulbs in one pack for immediate replacement and backup. If your equipment lists part number 640351 for the primer bulb, this 2piece set provides a ready replacement to maintain reliable starting and routine maintenance.