i'm trying to attatch a 1/4'' locline to distribute the flow that's coming out from a mj1200 pump, but the Y piece doesn't seem to fit into the outlet. I've seen people do it before so not sure what I'm doing wrong. The outlet of AP24seems to be composed of 2 seperate parts, and they both seem just a tad small for the 1/4'' Y piece. Any suggestions?