Air vent, (Dia)70mm

Does the job. Fits into a 70mm hole. Look good.
But make sure that you check the packaging, as the one (last one in the shop) I bought only had 3 vents in it (didn't think to check in the shop) - thankfully I only had 3 holes to fill.

Tight fit compared to those i've replaced, not yellow after the first year, have the same insect slat dimensions as other ones I've tried. Better plastic than some others, fit and forget.

Pretty useless without an insect/fly screen.

May as well just leave a big hole for them to climb through.