How do i stop water pressure from a punch being syphoned out of a punch bowl and into a beaker with a burret?

I am making a drinking apparatus for a party. I have punch in a bowl. It is siphoned from there through a small rubber hose. That hose drains into a glass beaker with a burret on the bottom that the kids can turn on and off to get the punch out of the beaker. The problem is that the punch fills up the beaker and doesnt stop. HOW do i make it stop and fill up only part of the beaker? Any ideas please help!|||You cannot stop that from happening. What you need is what is described in kinetics as a steady state. There is a constant drain of the punch at the end, and that doesn't happen in your case. What I suggest is you adopt the Spanish custom of pouring wine from a "skin flask" through a spout, directly into the guest's mouth. The fun is is that you hold the skin of wine three feet from the guest, and you aim the stream of wine at his mouth. Her agility is that she can catch the stream, of wine in her mouth without losing a drop.