I just opened up my return line cap kit to inventory everything and I came across a problem: as you can see in the first pic, there are four tees and four corner caps. I don't see how using four corner caps will work, given that the factory return line setup has three corner caps and one single barbed cap (located at cylinder #2; second pic). Is there a way to use four corner caps or is a single barbed cap required at cylinder #2?