Can you tell me what this is called?

[bluelakeside]

Hi all,

I need to order these things (that look like a question mark), and I don't know my terminology. They are the plastic spacers for the piece that runs around the pool (the "lip").

Can you tell me what they are so I can order replacements?

Thanks,
Brad K

PS - That was the color of my pool when I first took the winter cover off, looks beautiful now thanks to TFP!

 

[Poolsean]

It's an expansion strip, but I'm not sure who makes that form (it looks preformed plastic). You can replace it with calking, instructions available on line.