Dallas Specialty & Mfg. Co. manufactures a full line of flexible PVC sewer couplings since 1983. Its newest addition are the Stainless Steel Shear Banded Series couplings, or the “SR Series.” It is also known as its Green Label Series. Couplings are manufactured in the company’s Greenville, Texas, facility. They meet ASTM C-1173 and all U.S. and Canadian codes.