2 Pieces 694395 Primer Bulb fits Briggs & Stratton Lawn Mower 496115 4180 5085 5085H 5085K

What It Is

This is a 2-pack of aftermarket primer bulbs (part number 694395) designed to replace the rubber priming bulb on Briggs & Stratton lawn mower engines. It’s used to manually pump fuel into the carburetor before starting—common on walk-behind mowers, riders, and small engines where the primer bulb is exposed to cracking or hardening over time.

Fitment & Compatibility

Before buying, confirm your engine’s model and part number. This bulb fits Briggs & Stratton engines that use OEM part numbers 694395, 496115, 4180, 5085, 5085H, or 5085K. It also replaces many other cross-reference numbers (e.g., 694396). Check your current bulb’s diameter (typically ~1 inch) and stem length—this bulb is a standard push-fit type. It does not fit all Briggs engines; avoid if your engine uses a different primer system (e.g., integrated into the fuel cap or a push-button style). Measure the mounting hole on your carburetor or fuel tank—this bulb is designed for a snug, friction-fit installation, not screw-on or clip-on.

Key Things to Know

• Quality: Aftermarket—expect a slightly softer rubber than OEM. It works, but may degrade faster in extreme heat or UV exposure.
• Installation: Very easy (5-minute job). Pry out the old bulb with a flathead screwdriver, push in the new one. No tools required beyond that.
• Common gotcha: The two-pack is useful because bulbs can tear during installation if the hole edge is sharp. Lubricate with a drop of oil if it’s tight.
• Fitment caveat: Not all Briggs engines use this exact bulb—double-check your engine’s model number (stamped on the valve cover or blower housing) before ordering.

Should You Buy It

If you need a cheap, quick fix for a hard-starting mower with a cracked or missing primer bulb, this is a solid buy. It’s not OEM quality, but at ~$3 per bulb, it’s fine for occasional home use. Avoid if you want a long-lasting part for a commercial mower or if your engine uses a non-standard bulb shape.