Like the more solid pipe. Individual pipes are easier to replace when need be - instead of having to replace an entire panel for one slat being badly damaged. Love the gates between each run. And the gravel.
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Walls - Nantucket Stable Stall by Classic Equine Equipment- love the open feel, and the metal bars instead of wooden rods can cut down on the possibilities of the horse gnawing on the wooden stall. and it also makes for easy wipe down.