PTL47W-P4 filter

Dimensions
Diameter: 152 mm
Length (excluding handle and threaded part): 216 mm
Top: handle
Bottom: 1½" MPT thread (46-47 mm outside diameter)

Check that the thread of your old filter matches the photo. If it is "coarser", with more widely-spaced turns, then it is an SAE-type thread and you need a PWW50 filter.

Spa manufacturers who use this filter
Costco, HydroSpa, LA Spas, Sundance Spas

Part numbers
Pleatco : PTL47W-P4
Darlly : SC709 / 60471
Unicel : 6CH-47
Filbur : FC-0315