Pentair 195612 Spring Replacement FNS and Quad Pool/Spa D.E. Filter Spring replacement Fits Pentair FNS pool and spa D.E. filter models FNS24, FNS36, FNS48, FNS60 Also fits Pentair Quad pool and spa D.E. filter models QUAD60, QUAD80, QUAD100 Measures 1-1/4-inch length by 1-1/4-inch height by 1-1/4-inch width