This is a scaled down version of a vent cap often used for larger 4 inch pipes. The cap prevents rain and debris entering the vent pipe without blocking the crucial venting function.
The cap is designed to be attached with 4mm screws. However any self tapping or wood screw will do in a pinch.
Please print this is something heat and UV tolerant and then paint it before use.
The author marked this model as their own original creation.