84004416 Fuel Tank Cap Compatible with 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, designed for Briggs & Stratton 675Exi and 725Exi series lawn mower engines. It seals the gas tank to prevent fuel leaks and evaporation, and the attached tether keeps the cap from getting lost during refueling.

Fitment & Compatibility

• Direct fit for B&S 675Exi and 725Exi series engines (common on Toro, Craftsman, Husqvarna, and John Deere walk-behinds).
• Replaces OEM part numbers 594061 and 597414. If your original cap has either number stamped on it, this will work.
• Not universal – check that your tank opening diameter is ~1.5 inches (38mm). Measure the inner neck of your tank, not the outer thread.
• Cross-check your mower’s model number (found under the seat or on the engine shroud) with B&S’s parts lookup to confirm compatibility.
• Tether length is about 6 inches – ensure your tank neck has a slot or loop to attach it.

Key Things to Know

• Quality variance: Some users report the seal is slightly thinner than OEM, which can lead to a loose fit over time. Check for a snug seal immediately after installing.
• Installation: No tools needed – screw on by hand until snug. Avoid overtightening, as the plastic threads can strip.
• Tether attachment: The tether loop is small. If your mower lacks a dedicated anchor point, you may need to zip-tie it to the frame or fuel line.
• Common gotcha: This cap is vented. If your mower stalls or runs rough after installation, ensure the vent hole isn’t clogged (blow through it to test).

Should You Buy It

Buy this if you need a budget-friendly replacement for a lost or cracked cap on a B&S 675Exi or 725Exi engine and don’t mind a slightly less robust seal than OEM. It works well for most users, but if you want guaranteed long-term durability, stick with the genuine B&S part (594061 or 597414).