Pride Plumbing came out and performed the following work: 1) after cutting an access in the ceiling, we cut out, removed, and replaced 20-feet of cast iron drain line with new PVC piping and fittings - connecting onto the existing cast iron drain piping with new no-hub couplings - and used a sewer machine down through the drain line to ensure that it was clear of blockages; and 2) replaced a leaking Sloan flush valve on an American Standard commercial toilet with a new one.