My nipples are leaking not from the sides, but the actual nipple itself. What I learned is that nipples cannot handle a high PSI--and with my 55 gallon barrel feeding the nipples, it's way too much water pressure so they will leak. Nipples need 0-5 PSI, so that simply won't work for me. I have purchased a Little Giant watering cup on Ebay that can handle up to 70 psi. When I get that sucker installed, I will put the photos and results here.