The split nut union is used on heaters that attach to 2 inch inner diameter (ID) plumbing. Heater tube is usually 2 inches ID.
NOTE: Actual approximate size of the union is 3-1/16" ID, not 2". Measure the ID of your current "CLOSED" split nut or regular nut. If it measures 3-1/16", then you need the 2" split nut. Please confirm the size before placing an order.
Size of Split Nut & O Ring Gasket: The hot tub heater split nut union measures approximate size of the union is 3-1/16" ID, not 2", which is suitable for 2 inches heater assemblies. The O ring gasket measures approx. 2.2 inches in ID and 3 inches in OD.
High-quality Material: the heater union split nut for hot tub is made of quality plastic material, reliable and reusable, sturdy and lightweight, not easy to break or bend.