Type of product: Water jet diffuser Make and model: Pentair Cyclone Jet Colour / Finish: Clear plastic Commonly used with: Master Spas Dimension One, Down East Spas, Emerald, Great Lakes, Marquis, Master Spas(Not all models), Reflections, Thermospa, Vita Spas and many many more brands, simple compare the pictures or call Connections: Twist lock Dimensions: Diameter of face: 63mm Height if stood on its face: 103mm Diameter of rear nozzle: 18mm Additional notes: Push evenly on the rear of the jet fitting to assemble. WARNING: the likelihood is that you may end up breaking one or two before getting one to fit correctly so it's often worth buying an extra one just in case.