Hot Tub Parts Products Heater Union - 2" Split Nut w/ screws (#4005421) $4.16 Heater Union - 2" Split Nut w/ screws (#4005421) $4.16 Model Number: 4005421 Heater Union - 2" Split Nut w/ screws (#4005421) Mfg. #400-5421 Maximum quantity exceeded Minimum purchase amount of 0 is required Maximum purchase amount of 0 is allowed 4.160 10000000 Manufacturer: Waterway Description Heater Union - 2" Split Nut w/ screws (#4005421)Mfg. #400-5421 Search