I bought all my hardware at the Home Depot today to start building my UDS. I bought 3 3/4x close nipples and 1 ball valve and 2 caps. This is what my parts list called for. Before i start drilling, can anyone tell me why you need all 3? I would think just one nipple with the ball valve could give me all the range I would need. Why the other 2 with caps? Is this overkill?