This is a rebuilt Hayward DE36 Complete grid nest. I own a respected pool company and rebuild filters throughout the year. So you're in good hands with these. Please keep in mind that the ones you see in the photos do not represent the one you may come to buy. I have both 4800's and 3600's. The 3600 go for $350 with a used manifold and the 4800 go for $400 with a used manifold. If you want a new manifold then add $75. Feel free to ask If you ever have any questions at all you can call or text. Names Garrett