Used on: Saratoga,Gatsby, Jacuzzi/Blue Ridge, Hydro-Quip, Dynasty, Savannah and Sunbelt spas.
Inside diameter of nut is 3 3/8"
Black replacement threaded nut slides down over heater body. White split ring is then also slid on after nut, and nut pulls split ring up against heater flange to make seal against 3/4 inch barbed white threaded elbow.
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