Guardian Spa Filter Replaces Pleatco PMA45-2004-R Unicel C-8341 Filbur FC-1007 Master Spas Ft. Wayne Spas 8-1/4'' diameter, 7-3/16'' length, open hole top & bottom: 4-1/16'' Replaces Pleatco PMA45-2004-R | Unicel C-8341 | Filbur FC-1007 Down East, Ft. Wayne Spas, Master Spa Filter area- 45 sq. ft. Raised Lip Top