AC14HCA Replacement Spool Cap Compatible with Ryobi Weed Wacker 18V, 24V, 40V, Trimmer Line Cover 993373001 for Ryobi One+ String Trimmer (3 Pack)

What It Is

The AC14HCA replacement spool cap (also labeled as trimmer line cover 993373001) is a plastic cover that snaps over the spool housing on Ryobi One+ string trimmers to keep the trimmer line contained and protected during use. It’s designed for 18V, 24V, and 40V cordless models, sold in a 3-pack for convenience.

Fitment & Compatibility

Before buying, check that your Ryobi trimmer uses the standard “bump-feed” spool design common to the One+ lineup. This cap fits most Ryobi 18V (e.g., P2008, P20108), 24V (e.g., RY24420), and 40V (e.g., RY40200) string trimmers, but not all—some newer or older models may have a different snap pattern. Measure the outer diameter of your existing cap: it should be roughly 2.5 inches. Verify the OEM part number on your current cap (often stamped inside) matches 993373001. This is an aftermarket replacement, not Ryobi OEM, so fitment can vary slightly—test the snap before assuming it’s secure.

Key Things to Know

• Quality: Plastic is decent but not as thick as OEM. It may crack if overtightened or dropped on concrete. Expect 1–2 seasons of typical use per cap.
• Installation: Easy—just line up the tabs and press down until it clicks. No tools needed. If it doesn’t snap firmly, the tabs may need gentle bending inward.
• Common gotchas: The cap can pop off during high-speed trimming if the spool is overfilled or if the retaining tabs are worn. Keep a spare in your pocket. Also, this cap does not include the spool or line—it’s the cover only.
• 3-pack value: Handy for losing one or for multiple trimmers, but you’ll likely only need one at a time.

Should You Buy It

If you’ve lost or broken the original cap on your Ryobi One+ trimmer and want a cheap, quick fix, this 3-pack is a good budget option. It’s not as durable as OEM, but for $7, it’s fine for light-duty use. Skip it if you need a heavy-duty replacement or have a non-standard Ryobi model.