Length:Length is measured from the outside edge of end cap to end cap, not including any handles, threads or slip fittings. 9-3/4"
Bottom:Outer Diameter (OD) of threads measures approx. 1-7/8.1-1/2" Fine Thread
Premium replacement for:Unicel:Unicel part numbers either start with a "C" or contain a "CH" like "C-8475RA" or "6CH-49".6CH-35
Pleatco:Pleatco part numbers start with a "P" like "PWW100ST".PTL35W-P4-4
Filbur:Filbur part numbers start with an "FC-" like "FC-0360".FC-0320
We have several vacation rentals with hot tubs. We purchase all of our filters abs supplies for the spa depot. They have always been very good to us. On my last order I mistakenly ordered the wrong filters. My sales rep with the spa depot fixed it, sent a call tag for the wrong item and was super helpful. They get 5 starts and a thumps up from us!
I can't buy these filters locally. SpaDepot is a blessing...