2.0" Flo-thru Heater Housing split nut 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 split nut 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 heater split nut unions. They have a large flange & are (not) usually for pump unions.
This is one of the most popular split nut unions, it is made to replace heater flange nuts. It has a large flange for stainless steel housings. This split nut will fit Balboa, Brett Aqualine, Cal Spas, Gecko, Gulf Coast, Hydro-Quip, and many others with metal 2 inch heater assemblies. This split nut will fit most 2.0" heater unions. Due to the large flange, they will fit heater union assemblies. We recommend a O-ring 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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