2.5" Split nut for pump unions and 3.0" stainless steel heater housings. Commonly found on Waterway executive series wet ends and low-flow heater assemblies (Gecko M-class and Saratoga). They are made to replace pump union and heater split nuts. Measurements: Outer diameter- 4.0" Flange opening- 3-1/4"
Note: The 2.5" is not the actual measurement but a representation of the inner diameter of the plumbing that is used.
Manufacturer's 90 day limited warranty free of defects