84004416 Fuel Tank Cap for B & S w/Tether 675Exi, 725Exi Series Lawn Mower Gas Tank Caps Replacement (replaces 594061, 597414)

What It Is

This is a replacement fuel tank cap with a tether for Briggs & Stratton engines on lawn mowers, specifically designed for the 675Exi and 725Exi series. It seals the gas tank to prevent leaks and debris ingress while keeping the cap attached to the mower.

Fitment & Compatibility

Before buying, confirm your engine is a Briggs & Stratton 675Exi or 725Exi series (check the model number on the engine shroud or valve cover). This cap replaces OEM parts 594061 and 597414. It fits most walk-behind mowers with these engines, but measure the tank filler neck diameter – it should be roughly 1.5 inches (38mm) across. Not compatible with older B&S engines or other brands without verifying dimensions. If your mower has a different tether attachment point, you may need to drill a small hole.

Key Things to Know

• Quality: Aftermarket cap; some users report the tether is slightly shorter or less durable than OEM. Inspect the plastic for cracks before installing.
• Installation: Tool-free – unscrew old cap, screw on new one. The tether clips or loops onto a fixed point (fuel tank bracket or handle). Ensure it’s secured so it doesn’t dangle near hot engine parts.
• Common gotcha: The tether may not fit all mower frame points. If it’s too short, you can replace it with a generic tether or zip-tie the cap to the handle.
• Venting: This cap should be vented (check for a small hole or valve). A non-vented cap can cause fuel starvation or pressure buildup.

Should You Buy It

If you need a quick, cheap fix for a lost or cracked cap on a 675Exi or 725Exi mower, this works. It’s not as robust as OEM, but at $6.99 it’s a solid budget option for basic replacement. Skip it if you want a perfect tether fit or need a cap for a different engine series.