2.0" pumps unions measure 3.0" the measurements were made up by the pool & spa industry not BW Spa Parts. The reason it is called a 2.0" spa/pool/jacuzzi bathtub pump union is to let you know that it attaches to 2.0" pvc plumbing pipe, pvc pipe, flex pipe & (flexible pvc). They are made to replace pump union nuts. They have a small flange & are (not) for heaters unions.
This split nut will fit most 2.0" pump unions. Due to the small flange, they will not fit heater union assemblies. We recommend a Flat Gasket to help ensure a water tight seal.
Note: The 2.0" is not the actual measurement but a representation of the inner diameter of the plumbing that is used.
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