he Pleatco PSN25P4 fits in select Sunrise Spas that use this size top load filter. Sunrise Spas has used several different filter sizes over the years. This filter fits various Sunrise Spas models. For optimal fit and performance, verify that this filter cartridge matches the dimensions of the old filter in your spa.
 
Filter details:
Part no: PSN25P4
Diameter: 6" (152mm)
Length: 6" (152mm)
Top Hole: Handle 
Bottom Hole: 1 1/2" MPT
Media: 25 sq.ft.
Brand: Pleatco Premium