This is a TANK LID 60SQ FT - 170022 and fits  Pentair FNS Plus pool and spa D.E. filter model FNSP60.

• Tank lid assembly replacement
• Fits Pentair FNS Plus pool and spa D.E. filter model FNSP60
• Measures 20-1/2-inch length by 25-1/4-inch height by 20-3/4-inch width