Measure for Post Caps

All of our post caps are made to fit posts of their respective size. For example, a 4" post cap will fit a post with a 4" outside diameter. A 5" post cap will fit a post with a 5" outside diameter. Often, a so-called 4" x 4" post is actually 3.625" x 3.625" when measured. This is why we strongly encourage you to measure your posts before you order. There's nothing worse than having your post caps arrive only to realize they are too big or too small! Once you've found the actual size of your posts, the fun part begins. It's time to pick out caps! Questions? Call our experienced post cap crew at (800) 878-7829 today.


For Solar, Low Voltage, and Vinyl Post Caps:


Our Cap Size (OD) Post Size
2" 2" x 2" Aluminum Posts OD
3.5" 3.5" x 3.5" Vinyl Posts OD
3.625" 4" x 4" Wood Posts (3.5" x 3.5" OD)
4" 4" x 4" Vinyl Posts OD
4.5" 4.5" x 4.5" Vinyl Posts OD
5" 5" x 5" Vinyl Posts OD
5.625" 5.625" x 5.625" Wood Posts (6" x 6" OD)
6" 6" x 6" Vinyl Posts OD


For Trex:


Our Cap Size (OD) Fits Trex
2.5" Trex Signature Aluminum Railing Post
3.625" X
4" X
4.5" Trex Select 4" Railing Sleeve (4.5" OD)
Trex Transcend 4" Railing Sleeve (4.5" OD)
5" Trex Seclusions 5" Fence Post
Trex Horizons 5" Fence Post
5.625" Trex Select 6" Railing Sleeve (5.625" OD)
Trex Transcend 6" Railing Sleeve (5.625" OD)
6" X
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