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Because shipping a single cap as a parcel costs more than the cap itself. Freight does not depend on quantity: one cap and ten caps travel in the same parcel. With a pack you therefore pay the shipping once for an entire side of fencing. About eleven posts are set for roughly 25 meters of fence, so one pack covers almost all of it.

Measure the tube, not the old cap. What matters is the cross section: 60 x 40 mm on the common double-rod mesh fence posts, 60 x 60 mm on corner posts made of square tube, 40 x 40 mm on light posts and 80 x 80 mm on the gate post. Within 60 x 40 mm the version also differs: for the type A fence post there is the cap with an overhang, for types P and U the flush version.

Plastic fades under UV radiation and becomes brittle over the years, whereas aluminum stays color-stable. On a fence behind the house this is barely noticeable; on the street side it is clearly visible after a few years. Aluminum is also available in three shapes: flat, as a cube and with a ball. The flat cap keeps the line calm, while the cube and the ball create a visible finishing detail.

It closes off the top of the post tube. Without a cap, rainwater runs in and stands above the concreted base, because it cannot drain away at the bottom. On a hot-dip galvanized post it takes a long time before anything becomes visible. On a powder-coated post, corrosion works from the inside out and makes the coating flake off at the edge of the tube.

By up to one meter with the insert adapter, without breaking open the foundations. The adapter is inserted into the top of the existing post, and a shortened piece of post goes on top of it. Beyond that, the leverage on the foundation increases so much that the installation needs to be recalculated, because the existing foundation was designed for the original height. That applies all the more if privacy screen strips are to be woven in as well.

The post lacks the reserve for the additional wind load. With strips woven in, the fence is no longer an air-permeable surface: the wind pushes against it instead of passing through. For existing installations there is the universal post reinforcement, which is pushed into the post and absorbs the bending. If you are building new and plan on a privacy screen, choose the privacy screen post with the stronger 80 x 40 x 2 mm tube from the start.