Replacement cartridge for Martec under-cabinet filter system/ Dimensions are 11 3/4"x 4 7/8"
MFG Unicel or Pleatco/ Dimensions are 4-15/16" x 9-1/4"/ MFG# C-4335
MFG Unicel or Pleatco/ Replacement for top load pressurized system/ Dimensions are 4-15/16" x 13-5/16"/ MFG# M-4326
MFG Unicel/ MFG# 4CH-24
MFG Unicel or Pleatco/ Dimensions are 4-1/4" x 4"/ MFG# C-4310