Master Spa outer filter X268325 is a 40 sqft. filter cartridge.

40 Sq. Ft. Antimicrobial outer filter. Used from 2006 to current.

Outside Diameter: 7-7/16"
Length: 8-1/4"
Top: 4" with raised ring
Bottom: 4" with raised ring

This filter also replaces PMA45-2004-R, C-8341, FC-1007M, MA45-2004-R

You may also need the inner Eco Pur filter X268056.