SQUARE Pole Top Caps
These are available in square styles in several different sizes.
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SBD's 6-1/2" OD Square Black Light Pole Top Cap | Glass-Reinforced (UV n Weather Resistant) Polyester Tubing Plug W/Four Bendable Steel Straps for 7" ID | Made in USA
SB Distribution Ltd.
$17.25 - $419.95SBD Square 6-1/2" Black Light Pole Top Cap Tubing Plug ' Glass-Reinforced Polyester Made in USA' W/Four Bendable Clips/Straps for 6" ID Made In USA By Deltech Manufacturing SBD Squre 6-1/2" Black Light Pole Top Cap Tubing Plug | Glass-Reinforced...$17.25 - $419.95