Customer has a slow bathtub drain. Discovered bath tub has a drum trap from the 1930's installed upside down and galvanized drain lines. We completely removed the entire drum trap assembly, tub drain assembly and installed all new PVC piping and a 2" p-trap drain for maximum drain flow into the existing plumbing system. Most typical tub drains are 1.5" diameter and we upgraded to 2" diameter.