This Replacement filter cartridge replaces Unicel # C-4600, Pleatco # PMS8TC and Filbur # FC-3850 while complies with OEM # PMS8T/C specifications. This 8 inch long and 4 5/16 inch wide filter cartridge closed at its top while 2 3/16 inch hole at the bottom. This high quality filter cartridge is capable of handling the top load of 8 square foot and bet suitable for 8 SQ. FT. Muskin and Sears. Very easy to install this filter cartridge is made of high grade materials.