Pole caps for four different diameters of mast / pole : 1 inch, 1.25 inch, 1.5 inch and 2 inch.
Pole caps are plastic caps (or bungs) placed over (or inside) the ends of aerial masts. Their primary purpose is to prevent wind noise, though I have to say that worrying about the wind noise you’d get from the pole, when there’s an aerial mounted on the end of it, is like the captain of the Titanic worrying how much it’ll cost to clean his uniform when it gets soaked as the freezing North Atlantic water creeps inexorably up his ship……
Actually, joking aside, it must be said, under certain conditions, you can get a low whistle created when wind blows across the end of a pole, it’s fairly rare and not usually that loud either but, unsurprisingly, it sounds a bit like an organ note.
Other uses of pole caps are for masts concreted into the ground, to stop them filling with water !
NOTE ! : The 2in pole caps do NOT fit scaffold poles, because the latter are actually 48mm in diameter and have 4.0mm thick walls.
You could argue that steel poles (Pre Galv, not hot dip galvanized, the latter is far better….) benefit from mast caps, because they often start rusting from the inside first, and the cap helps to prevent the ingress of water, though they also prevent it drying out as well, so just fit one to the top of the pole (the last time I checked water flowed down hill). Actually it’s probably better to avoid caps in the bottom of poles (or drill holes in the bottom one) because you don’t want them filling them water do you ?
Note that external pole caps may be theoretically slightly more waterproof then internal fit types but in my experience the latter are significantly more durable. The former tend to harden in the sun, split and fall off. And anyway, if you’re only fitting a cap to the top (which we recommend) then being absolutely waterproof isn’t that important.