4" x 4" Vinyl Post Sleeve by RDI

$9.99 - $36.99
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(23 reviews) Write a Review
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7-9 Bussiness Days

RDI Endurance Original Rail Post Sleeve

NOTE ~ Sleeves ship UPS Ground or LTL with a 4-5 week Lead Time


  • 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

final-line-color-white.png final-line-color-dune.png final-line-color-earth.png

Click HERE for Warranty:

Click HERE for 6x6 Sleeves:


23 Reviews Hide Reviews Show Reviews

  • 4
    4 x 4 vinyl sleeves

    Posted by Harrry Freeman on Jul 9 2020

    Very nice as I wanted

  • 5
    Vinyl post sleeves

    Posted by Gerard Pagliuco on Jun 17 2020

    Exceeded my expectations. Durable,quality product. Fast,easy transaction. Thanks!

  • 5
    Comes Plastic warp individually, no scratches!

    Posted by Yan Ding on Jun 10 2020

    Great product, very rigid, straight, and clean. Perfect size: 4x4 is 3-1/2", inside of sleeves is 4-3/4". It is wrapped up in clear plastic individually. Very beautiful, good price, can't ask for more. I want to buy more. Excellent customer service too!

  • 5
    Vinyl Post Sleeve

    Posted by Brian Butterfield on Jun 3 2020

    Exactly what I was looking for! Great product, really like the Earth color.

  • 5
    Terrific product

    Posted by Lyn on May 29 2020

    We were updating our back deck and while the existing posts were still sound, they weren't very attractive. The post sleeves and bases (Earth color) were exactly what we needed. I wish I could include a picture because I am that proud of the finished product. I am glad we found this company. Quick delivery and great price.

  • 5
    39" sleeves

    Posted by JAN M CECHAK on May 28 2020

    Great price and product! Highly recommend.

  • 5
    Vinyl post sleeve

    Posted by Jen on May 14 2020

    I purchased the Earth color post sleeves for a front yard DIY fence project. They are beautiful and the quality blew me away. I ordered the matching post caps which are also very good quality. I now have the best looking fence on the block!

  • 5
    Just as described

    Posted by Nancy on May 13 2020

    Sleeve is exactly as described, very good quality. Shipped quickly, I am very pleased.

  • 5

    Posted by David on May 9 2020

    Cheaper than the big box stores, quick shipping, good service. Definitely will use these guys again.

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