4" x 4" Vinyl Post Sleeve by RDI

$13.99 - $46.99
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4x4 Vinyl Post Sleeves by RDI


  • 3 neutral colors to choose from: white, clay, and sand 


  • Material: vinyl ~ vinyl’s base ingredient is rigid PVC (polyvinyl chloride), providing superior strength and ultraviolet resistance

  • 6 different lengths to choose from: 39”, 45”, 54”, 100",108”, and 120” (white is available in all lengths)

  • 1/8” wall thickness

  • Inside dimensions: 3-3/4” x 3-3/4”

  • Outside dimensions: 4” x 4”

Click here for 6” x 6” post-sleeve


  • Post-sleeve (quantity = 1)

  • Installation instructions


  • SolarGuard® technology provides fade resistance, maintaining a like-new color

  • Drill free installation 

  • Compatible with any vinyl rail system

  • Fits any nominal 4” x 4" (3-1/2" x 3-1/2")

Our vinyl is impact modified for flexibility and durability. All RDI post sleeves meet or exceed the requirements for long-lasting durability and performance after installation.

About this product…

Post-sleeves are used to cover existing posts that you may have on your deck, in your yard, or around your home. If you’re looking to update a space or make your home feel more in line with your desired aesthetics, post-sleeves are a cost-effective and easeful solution, not requiring you to remove previously installed posts. One quick home improvement that will transform your whole space is upgrading old posts that support deck or porch railing systems. Using vinyl post sleeves from RDI, you can give your porch or deck a much-needed refresher at a very minimal cost. Simply apply the 4” x 4” post sleeves to any unsightly, weathered, or worn down posts, and you’ll notice an instant sense of accomplishment in making your home look welcoming and refreshed. 

Made from sturdy vinyl, this sleeve can withstand all kinds of weather, including humidity, rain, snow, and extreme heat. Easily installs over the internal structural post.

4” x 4” Vinyl Post Sleeve Installation:

Simply follow the installation instructions provided in your order.

Whether you’re conducting a complete remodeling project or are planning on investing a single weekend afternoon on sprucing up your home, you’ll appreciate how easy this post sleeve is to install and maintain.

Use our Base Post Trim (or Skirt) to complete the look 


Apply the adjustable base skirts to dress the bottom of your post. Can be applied at the top of the post, as well.

Install our 4” - 6” Post Caps to complete the look


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. 

*Colors and renderings may appear differently in person. Call 866-781-5033 to order color samples or if not satisfied. 

Click here for WARRANTY

Transferable Limited Lifetime Warranty Vinyl Railing Who is covered: • The limited lifetime warranty covers single-family residential properties only. This limited warranty extends to the original purchaser and one (1) individual transferee as specified herein. • A twenty (20) year limited warranty covers any other type of building or property including those owned by corporations, governmental agencies, partnerships, trusts, religious organizations, schools, condominiums, homeowner associations, cooperative housing arrangements and apartment buildings. The warranty period will be twenty (20) years following the original date of Product purchase.

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