No. The valves are manufactured to exacting tolerances and fully tested before leaving the factory.
If a leak occurs it is mostly due to over-torquing based on stock drain bolt specs. We've created our own torque chart with correct measures to help you avoid this.
If you have a leak that you think might be due to factory error, however, feel free to contact us to submit a request for a replacement valve.
As long as you got it from us directly, replacing it should be a breeze.