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This is a 1.5" heater union half assembly with split nut, for flow-thru heater housings. They are the most popular split nut unions assemblies. They are made to replace heater flange nuts with union. They have a large flange for stainless steel housings. The overall diameter of the split nut is 2 3/4" and the flange side opening is 1 7/8". This assembly will fit most metal 1.5" heater assemblies. We are also including a new O-Ring Heater Housing Gaskets to help ensure a water tight seal.
Includes: Split Nut, Union, Stainless Steel Screws & O-ring Gasket.