Cal Spas Filter - Medium (346 mm)
 
This is found on most Cal Spas models, Patio & Escape range hot tubs. 
 
Length: 346 mm Diameter: 130 mm Top: Closed/Handle Bottom: 38mm - hole/female/course thread
 
Fits Cal Spas Models - Kona, Pacifica, Tropical, Hawaiian, Atlantic, Bel Air, Swim Spas
(unsure which model you have? Check ID plate on side of cabinet)
 
Price is for a single filter.