I have unions on my pipes and when I take it apart for the winter, I cover the open ends of my pipes with a plastic grocery store bag and duct tape around the bag (so I don't get duct tape goo on the pipe). Then I put two pieces of duct tape over the end in an X to give the hole a little strength and then wrap another length around.
I the spring, I just cut the bag and duct tape away with a knife - being careful not to damage the O-ring seat.
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