Set of 2 Cartridges. OD is 143mm, Total Length is 425mm, Top is Handle, Bottom is 49mm Coarse Thread. Fits some Leisurerite Spas, Alpine Swim Spa, Endless swim Spa Models
OD is 152mm, Length is 205mm, Top is Handle, Bottom is 46mm Coarse Thread. Fits Signature Spas, and other models including: Designer Spas, Vortex Gemini, Oasis, Orbit, Alpha, Meridian, Fisher 2 , Fisher 3, Fisher 5 & Some Galaxy Spa models