6-5/8" x 15-1/2" Jacuzzi Spas Filter PJW60TL-OT-2A, 6CH-961, FC-2715, 6540-383 Jacuzzi Spa Filter PJW60TL-OT JWB (top open) 60sqft Diameter 6-5/8" Length 15-1/2" Top Style Open Top ID 2" w/slots Bottom Style SAE Thread Bottom ID 2" SAE Thd Pleatco PJW60TL-OT-2A Unicel 6CH-961, Filbur FC-2715, Sundance 6540-383