4x4 Wood Fence Post Caps (3.5in x 3.5in) - Waterproof UV Protection

In this review the Eapele 4x4 post caps are evaluated for homeowners and DIYers who want a simple way to protect exposed wood posts. The bottom line: these plastic post caps fit standard 4x4 posts (actual 3.5in x 3.5in) and provide straightforward protection against rain and sunlight while improving the look of a deck or fence. Installation is quick and the peaked design helps water run off, so the caps primarily appeal to those wanting a low-effort preventive solution for cracking and rot.

Key Features

• Exact fit: Interior diameter is 3.58in x 3.58in, designed specifically to fit 4x4 wood posts finished at 3.5in x 3.5in for a snug cover.
• Waterproof protection: Made from PP plastic, the caps shed rain and prevent water sitting on the post top where rot typically starts.
• UV resistance: The black finish reflects some UV and helps reduce sun damage and drying that can lead to cracking.
• Peaked design: The sloped top channels water away so runoff is less likely to penetrate the post end grain.
• Easy installation: Caps include black wood screws and can be secured quickly with a power screwdriver for a neat, permanent fit.
• Decorative finish: The caps tidy the post tops and provide a uniform, finished appearance for fences and decks.

Who It's For

These post caps are aimed at homeowners, landscapers, and deck builders who use pressure-treated 4x4 posts and want an affordable way to reduce maintenance. They work well for people who prefer a simple installation with screws and a durable plastic material that resists weather exposure.

Those who need heavy-duty metal caps, integrated lighting, or a custom ornamental style should look elsewhere; these caps focus on protection and a clean look rather than high-end decoration or metal durability in coastal conditions where different corrosion concerns may apply.

Pros & Cons

Pros

• Fit well on standard pressure-treated 4x4 posts and sit flush for a neat finish.
• Included screws and straightforward design make installation fast and easy.
• Peaked, waterproof shape helps keep rain off the post end grain, reducing the risk of rot.
• Good value for a bulk set, with spare screws included for multiple posts.

Cons

• Plastic construction may not satisfy buyers who prefer metal caps for long-term coastal corrosion resistance.
• Some reports from users suggest hardware can show rust over time if local conditions are harsh.

Specifications

Fits post	4x4 (actual 3.5in x 3.5in)
Interior diameter	3.58in x 3.58in
Material	PP plastic (waterproof, UV-proof)
Color	Black
Package quantity	48 pcs (includes screws)
Design	Peaked top for water run-off

Our Verdict

The Eapele 4x4 post caps are a practical, cost-effective choice for anyone wanting to protect standard 4x4 wood posts from water and sun damage while improving curb appeal. They offer easy installation, a reliable peaked design to reduce rot risk, and useful extras like screws, making them a good value for most residential fencing and decking projects.

Frequently Asked Questions

Do these caps fit standard 4x4 pressure-treated posts?
Yes - the interior measures 3.58in x 3.58in and is intended for 4x4 posts that are 3.5in x 3.5in in finished size.

Are screws included for installation?
Yes - the set is sent with black wood screws so you can secure the caps quickly with a screwdriver or power driver.

Will the plastic withstand sun and rain?
The PP plastic is described as waterproof and UV-proof and the peaked design helps shed water, though buyers in very harsh environments should monitor hardware for rust over time.