These replacement spouts will fit most Nûby™ Super Straw™ and Super Spout™ cups that have a standard sized top. They are designed to make the transition from nipple to spout drinking easier. Like many of our silicone nipples, the Super Spout™ replacements feature a No-Spill™ Touch-Flo™ valve that opens instantly with a small amount of pressure, making it easy and simple to drink from.