Dallas Specialty & Mfg. Co. is a U.S. Manufacturer of Plumbing, Irrigation and Water Works Products for 36 years. Products: Flexible PVC Transition Couplings (C.T. Adapters) are one of many of our Specialty Items as well as the original 40 mil. PVC Shower Pan Liners (Perma-Gard) and Plastic Shower Drains (PVC/ABS). Our new PVC Two-Way Clean-Out joins our line of other Clean-Outs, Flush type, Sewer Lateral c/o’s plastic and cast iron. Our Plastic Valve Boxes and Meter Boxes are also a mainstay of our product line. Also Closet Flanges are one of the most complete assortments, with Stainless Steel Rings, Galvanized or Plastic Offsets and Gasketed Flanges.