Poly and poly were prepared from post-consumer polycarbonates and polyesters, respectively, using a single vessel in batch mode. which is made from sheet material that is cold rolled and whose embossments are work hardened without any post embossment heat treating that would act to harden the material. The housing includes a first area and a second area. Still other aspects of the disclosure provide for reduced leakage through tight gaps between components of a gerotor system.