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Split Nut Measurement:The inner size (back side) is 2.3 inch, the inner size(front side) is 3.12inch,only fits 2" Heater Assemblies,not fits LX Heater Actual Oring Measurement:The inner size is 2.08 inch, the outer size is 2.87 inch,O-ring fits for Balboa,Gecko,HydroQuip,Spa Builders,Correctech,Spanet,not fits LX Heater Package Include 1 pcs Heater Split Nut Unions with Screw , 1 pcs Heater Gasket / O-rings,we suggest that make sure the size matches your project before purchasing! Please find the mark(1or 2) on each split nut,the same number can be matched successfully,otherwise the thread will be misaligned Please not choose the same size as your pipe,because the same size will be too tighten to be installed.