The company that closes our pool puts a plug like the one shown below into each of our returns so they don’t have to drain water out below the returns to winterize them and add antifreeze. My husband cracked the one in the shallow end return while taking it out at opening so we need a new one. What is this plug called and where can we purchase another one? I also need to know if we should purchase a new skimmer gizmo since the one that we have is probably 8-10 years old. Water level frequently rises above the skimmer over the winter before we are able to pump the excess water out, so I want to make sure that our skimmer is properly protected.

