Returned to customers house on a pcb After multiple dump tests on both sides of a two compartment sink, with running water and without, as well as running the garbage disposal and dish washer. A very small leak appeared on the union of the tubular plastic P trap. I disassembled the P trap to look for any abnormalities Both the slip nut on the top as well as the union were both very tight. No abnormalities in construction of P trap were noticed Slip nut gasket was not damaged Surface of compression seat of union was not damaged Reconnected the P trap, making sure all connections were tight, then ran several more dump tests on both sides of the sink, as well as just running water for an additional 20 minutes No leaks at this time Thank you for choosing CPI plumbing and heating