Kontes 19/22 female to 24/40 male ground glass adapter for chemistry distilling
This is all borosilic ate glass and all made in the USA. I have rinsed off the dust, but have not cleaned it. I am out of acetone and I’m arthritic, so you will have to clean it yourself. The upper, female ground glass connecter is 19/22 and the lower, male is 24/40.