Upon arrival, customer showed me the shampoo/ conditioner stand laboratory sink and I noticed it was leaking from the Fernco, where the tubular goes in from the back of the laboratory. So I removed hose from laboratory to see because the pitch was off. When I pulled out the hose, alot of backflow water came out. I pushed tubular further in and re-tightened down further than what was tightened down for customer. Ran water for about five minutes to make sure there was no further leaks. Customer is satisfied.