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This version is especially useful when one side of the system is solvent-welded and the other side calls for threaded attachment
Union end supports easier future disassembly
That combination matters because the best heater replacements restore both physical fit and thermal confidence in one complete repair
This model is especially valuable when the original switch no longer reacts accurately
Waterway Poly Jet Internal [4-3/16" FD] [Roto] [Deluxe Scallop] [White] (210-6190) grasslin This version is especially usefulThe Waterway 210 6190 Poly Jet internal is designed for compatible jet assemblies and features a 4 3 16 inch face diameter with roto action, deluxe scallop styling, and a white finish. An internal like this is useful because it combines a larger visible trim format with an active user facing jet pattern that helps restore the original feel of the assembly. The deluxe scalloped face gives this Waterway part a polished, premium look at the spa surface,
