8.75 Axle vent

I tried to clean it, but even after soaking it and blasting it with brake clean I can barely blow through it.

I thought about making one out of a pipe nipple, but it also holds the brake block in place. I guess I could get the correct length with a cap in it to hold the block in place, and as Supershafts suggested drill a small hole in it with a hose.

Thanks!