4" x 4" Vinyl Post Sleeve by RDI

$9.99 - $36.99
Contractor Rebates
(12 reviews) Write a Review
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7-9 Bussiness Days

RDI Endurance Original Rail Post Sleeve


  • Vinyl’s base ingredient is rigid PVC (polyvinyl chloride) modified to provide superior strength and ultraviolet resistance.


  • 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.

If you have recently purchased a home—or have even lived in the same home for a number of years—there may be some quick improvements that will help update a space and make a house feel more like your own. One quick home improvement that will do a world of good is upgrading old posts that support deck or porch railing systems. If you think that kind of work is bound to be costly, think again. Using vinyl post sleeves from RDI, you can give your porch or deck a much-needed refresher with 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.

RDI is so confident in the quality of its vinyl post sleeves that the company offers a lifetime warranty to guarantee your purchase.

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.


  • Sleeves are designed to slide over existing 4x4 posts. 
  • Inside dimensions ~ 3-3/4" x 3-3/4"
  • Outside dimensions ~ 4" x 4"
  • Includes 1 ~ Bagged Post Sleeve
  • The Endurance Original Rail vinyl post sleeve is compatible with any RDI vinyl rail system. The sleeve fits any nominal 4x4.
  • Note ~ Colors May vary 


  • 39"
  • 45"
  • 54" ~ (white only)
  • 100" ~ (white only)
  • 108"
  • 120" ~ (white only)


  • 1/8"


  • White
  • Dune
  • Earth

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Click HERE for Warranty:

Click HERE for 6x6 Sleeves:


12 Reviews Hide Reviews Show Reviews

  • 5
    Deck post sleave

    Posted by David on Jan 21 2020

    Easy to install. great quality will use again

  • 5
    4" x 4" Vinyl Post Sleeve by RDI

    Posted by les foote on Oct 12 2019

    Look great, easy to install! Great quality Makes job go so much faster!

  • 5

    Posted by Guy on Jul 27 2019

    Great buy ! Saved a decent amount of.money , compared to big box store and arrived 10 days after ordering .

  • 5
    Post Sleeves

    Posted by Jim Shores on Jun 18 2019

    For the beauty that these covers add they are a must have item. Super simple to install and they add the finishing touch to your project! I will definitely purchase again when the need arises! -Jim aka happy customer

  • 5
    4x4 post covers

    Posted by J J on Mar 9 2019

    I am renovating my old existing deck. I went on line for products and ideas, when I found Deck Expressions. I ordered these post covers and they look and fit great. They were delivered in about a week or so. ( NOT NEXT DAY - THIS IS NOT AMAZON! ) and I plan on purchasing Balusters / Decorated Trim in the very near future. J j

  • 3
    4x4 white post sleeves

    Posted by Richard jones on Aug 23 2018

    I purchased 11 sleeves. Delivery took some time but the price was the best I could find and the product worked great

  • 5
    Review Vinyl

    Posted by Mikki H on Jul 24 2018

    This was exactly what i have been looking for and they shipped in a timely manner i will order again from Deck Expressions.

  • 5
    RDI 4x4 post sleeve - 39 inches

    Posted by Doug on Jun 10 2018

    Great price. Perfect pre-cut height to go with 36" railings. Saved a lot of extra work versus cutting longer sleeves to size.

  • 5
    RDI vinyl post sleeves

    Posted by Jim Iaquinta on Apr 29 2018

    I was a little hesitant to order because the price was so much less than anywhere else but I am glad I did. Great quality for the same post sleeves they sell at the big box stores for more than 2 times the price. Shipping is free and it takes a little longer than usual because the sleeves came via semi-trailer truck. Seemed like overkill for 14 sleeves that weighted a total of 45 lbs. but the price was right.

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