Length:Length is measured from the outside edge of end cap to end cap, not including any handles, threads or slip fittings. (1) 4-5/8 (1) 6-5/8"
Top:This is the actual inside hole diameter, excluding any taper.2-1/8" Open
Bottom:This is the actual inside hole diameter, excluding any taper.2-1/8" Open
Premium replacement for:Filbur:Filbur part numbers start with an "FC-" like "FC-0360".FC-2388
Spa Depot provided perfect product for my spa. Excellent quality. It was the lowest price around and they shipped super fast.
Filter cartridges arrived on time as promised and met my expectations