Full Set of 8 Pieces Length: 25 3/8″ Width: 10 3/4″ Works for Purex / Pentair SMBW2000 Series / SMBW2048 Purex / Pentair SMBW4000 Series SMBW4048. Note: Collar has single notch and is covered with a black adapter. Length is measured from collar notch to opposite end of grid. MADE IN THE USA! 8 New Unicel FG 1248 Purex Replacement Grids. Works for Purex/Pentair SMBW2000 Series /SMBW2048 Purex/Pentair SMBW4000 Series SMBW4048.