Briggs and Stratton 590716 PLUG-DIPSTICK/FILL

What It Is

This is the OEM Briggs & Stratton 590716 combined dipstick and oil fill plug. It seals the oil fill tube on engines that use a threaded cap, allowing you to check oil level without removing the plug.

Fitment & Compatibility

Check before buying:

• Fits most Briggs & Stratton single-cylinder and V-twin engines with a threaded oil fill tube (common on push mowers, riding mowers, and small tractors). Not for push-in or bayonet-style caps.
• Verify your engine model number (located on the valve cover or blower housing). Cross-reference with Briggs parts lookup.
• This is an OEM part, not aftermarket. Direct replacement for original equipment.
• Thread size: 3/4-16 UNF. Measure your fill tube inner diameter if unsure.
• Does not fit engines with a separate dipstick tube and cap.

Key Things to Know

• Quality: OEM construction with a rubber O-ring for a tight seal. No leaks reported.
• Installation: Simple hand-tighten only. Over-tightening can crack the plastic handle or strip threads.
• Common gotcha: The dipstick markings are for cold oil level; check with engine cold and level.
• If missing or stripped: This is a common failure point on older mowers—replace immediately to prevent debris entry and oil loss.

Should You Buy It

Perfect if you need a direct OEM replacement for a lost, cracked, or worn dipstick/fill plug on a Briggs engine. Avoid if your engine uses a push-in cap or a separate dipstick tube. At this price, it’s the right fix for a simple, critical seal.