2" Spa Hot Tub Heater Split Nut Unions with Screws and Heater Gasket, Compatible with Balboa Gecko Hot Tub Heater Assemblies Replacement Parts, Replacement for 0121109020 Split Heater Nuts - 2 PcsBrand: AFZZ Color: Black Features: Split nut 2. 5 inch which includes split nut for hot tub split nut and Screws Spa Hot Tub Heater Split Nut Union Fitting for 2 inch heater assemblies. Pump Union Split Nut that measures about 3. 35" on the outside and mounts to the existing Pump Union Body using 2 screws to hold it in place. This Split Nut measures about 2. 30" ID and mounts on the old Pump Union holding flange and screws onto the pump threads with a