A 1/2" barb fitting is a way to narrow for a yeast dump, 3/4" should be the minimum consideration. Ideally, you can collect yeast directly from the valve's 1.5" TC, but if users want to utilize a hose to divert the flow of yeast they're going to need a large hose barb fitting.
This would be the minimum (3/4"):
This would be even better (1"):
I think the 1" is way more "Brewmaster" than the 3/4", you can find 1" silicone tubing to divert the flow on our website here ( 1" Silicone Tubing )