Ol' Capandball is using a tube with a clamp that stops the flow. I have a cleaning tube that is more universal, the one TOW sells. It does not have a shut off clamp. I could jerryrig one up, but wonder if anyone has a better idea. (4:02" he shows the clamp). My only idea is one of those little clamps that locks a sliding window. It clamps the metal frame around the window glass to the metal rail the window slides along.