MTpromises
Well-Known Member

I learned awhile ago that knocking abv out of the bowl was the way of keeping vape screens clog free. With regular ashtrays it's a pita knocking on the side. Enter espresso knock boxes.
This thing has been so much better than ashtrays. The bar itself is slightly rubbery so it a satisfying knock.
I went with a budget knock box to test it out, I think it was $18. The only thing I looked for was walls higher than the knock bar and blue. But it's been great.
Highly recommend.