I couldn't help but rip open this bag of flanges as soon as I got it. I am so excited to see if these growing pregnant nipples will fit inside of my flanges. I hook up my entire pump and put it up against my big darkening nipples to see if they fit. Only truly one way to see if these nipples fit and that's by turning on this powerful pump and seeing my nipples stretch and pull as it sucks. But what happens when the pump is on is a shock!