Matte Black 39"x4"x4" aluminum post sleeve
Bold and sleek matte black sleeve for standard 39" decks—durable and stylish.
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Avalon 4x4 Aluminum Post Sleeve – Stylish & Durable Decking Support
Overview
This is the genuine Avalon 4″ × 4″ aluminum post sleeve by RDI — a powder-coated aluminum exterior sleeve designed to cover and finish a standard 4″ × 4″ structural post (such as pressure-treated wood or steel) when installing RDI Avalon Aluminum Railing. It gives your deck or porch a clean, cohesive, low-maintenance look that matches Avalon rail components. This post sleeve can also be used a structural post by installing the installation kit-plate to the bottom of the post.
Key Features
- Fit: Slides over a nominal 4″ × 4″ structural post (actual 3⅝″ square).
- Material: Powder-coated aluminum that resists corrosion, moisture, and UV exposure for years of outdoor durability.
- Finishes & Lengths: Typically offered in Matte Black, Matte Bronze, and White, and in lengths such as 39″, 45″, and 108″ to match different railing heights and applications.
- Low maintenance: Unlike bare wood posts, the aluminum sleeve won’t rot, warp, or need staining.
How It’s Used
- Installed over a wood or structural post, the sleeve becomes the visible exterior of your railing support.
- Works with Avalon railing, brackets, post caps, trim, and other accessories (sold separately) to complete your railing.
- You’ll need post caps and trim rings to finish the look and cover fasteners.
Why It Matters
- Provides a finished, sleek appearance that matches the rest of the Avalon system.
- Offers weather resistance and longevity compared with exposed wood posts.
- Makes it easy to coordinate lighting, trim, and post accessories, such as solar or LED post caps.
DETAILS:
3 different lengths to choose from:
- 39”
- 45”
- 108”
3 different colors to choose from:
- Matte black
- Matte bronze
- White
WHAT’S INCLUDED:
-
Post sleeve (quantity = 1)
Not included:
*the Component List listed on the Installation guide are not included
- Post cap
- Post trim
- Mounting kit
- Bracket Pro Installation tool *used when installing over a 4” x 4” nominal post
- Inner structural post
More details:
- Low maintenance
- Can fit a 4” x 4” nominal post (3-5/8" x 3-5/8")
- Moisture, mold, and warp resistant
*All RDI post sleeves meet or exceed the requirements for long-lasting durability and performance after installation.
About this product…
Upgrade your outdoor space with a versatile solution that functions as both a 4x4 aluminum post and a decorative 4x4 post sleeve metal cover, especially when paired with the compatible installation kit for structural use. A 4x4 aluminum post wrap is a simple yet transformative way to enhance the look of existing posts on your deck, porch, or yard. Instead of tearing out weathered or outdated wood, this wrap acts as a sleek, modern covering, saving time, money, and effort. Whether you're aiming for a contemporary aesthetic or just want to refresh aging posts, this is a highly effective home improvement that delivers instant curb appeal. Post sleeves, particularly the Avalon series, are engineered for durability and style. Manufactured from powder-coated aluminum, this 4x4 connector sleeve resists corrosion and damage from moisture, snow, intense sun, and temperature fluctuations, making it ideal for year-round use in any climate. With this 4x4 post sleeve metal upgrade, you can conceal unsightly support posts and give your space a clean, uniform finish. It’s a low-maintenance, high-impact solution that makes your home feel brand new.
- Installation instructions for the 4” x 4” Avalon Post Sleeve are included.
- Any questions with installation, please call 1-877-265-2220
FAQ:
What is the difference between post-sleeves and post-wraps?
- There’s not a huge difference in aesthetic, rather how they are installed. Which you choose typically depends on the state of your existing posts. Post-sleeves are one piece, while post-wraps are made up of multiple pieces that clasp together. Post-sleeves are the perfect solution if your existing posts allow you space to slide a cover over the top of them, and you’re looking for maximum ease and time-spent when installing. Both post-sleeves and post-wraps offer a new and fresh look to an otherwise dated or worn railing system.
Warranty information
- Still have questions or need advice on ordering the right supplies for your project? Get in touch with Deck Expressions’ 24/7 customer service. We’re always ready to help.
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