Simple way to plug pressure lines?

[jgannon]

I think you'd be hard-pressed to find an easier way to do that with stuff from the KoP. One thing worth trying is using one of the flow control elbows with the knob tightened down all the way, but I'm not certain that that will actually give you zero flow. In any case, if you want to kludge it together for now, and then make it a little more elegant at the competition, take a look at McMaster part number 51055K429.