I got these to replace some leaking panels of mine but mine needed to be 4x10, so these don’t fit my system. These are 4 feet wide by 10 feet long with 2 inch headers. These heat water in the sun and return it to your pool a little warmer each time through. Works with your exiting pump. I have four panels in great shape plus one with a leak that might be an easy repair, I haven’t checked since the size was wrong for me. Asking 10 per panel with the 5th leaky panel free if you buy the other 4.