Customer stated that they needed help installing disposal due to drain piping isn’t coming apart. Took a look and found that whole drain was all hard pipe and they use silicone to keep it together. Recommended to customer I have drain reworked under kitchen sink. Reworked drain under kitchen sink and installed customer provided garbage disposal. Capped off hold dishwasher drain and plugged dishwasher drain into disposal. Tested work and at this time, there was no leaks present. Cleaned up work area. Water heater is 15 years old and would recommend to replace any leaking occurs. Will send an estimate to do so.