Necessary when the location of install is 4" or more below the road's surface, and is available in two lengths to best suit your installation location needs.
24" Upright Extension adds up to an additional 21" in height to the boom arm and mailbox (this will suit most ditch locations)
48" Upright Extension adds up to 45" in height to the ...
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Installed ky mailbox in a ditch and this extrndion worked perfectly to get the box to the proper height for the postal service.