Sundance Spas Jacuzzi Series Heater Stainless Steel Freeze Barb Adapter (P/N: 6540-034)
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Fits Stainless Steel tube heater part numbers 6500-402, 6500-063 and 6500-420.
Replaced the norlyn barb adapter in early 2011.
.125 inch MPT by .375 inch Barb adapter by .60 inch I.D. hole