This Replacement filter cartridge can serve as the replacement for Filbur# FC-2972, Pleatco# PLBS100 and Unicel# C-5397. The technical specification of the respective product is in compliance with OEM# R173601. Further, the physical specifications of the product includes width of 5 5/16 inch, length of 17 13/16 inch and is open ended from both the sides with hole of 2 1/8 inch each. This replacement filter cartridge can be used in 80 square feet Rec Warehouse S/2 G/2 Spa, Pentair Pool Products-Rainbow Pl ,QCA, Leisure Bay Spas, Leisure bay mfg and Waterway Plastics.