Illinois and Northwest Indiana's premier manufacturers representative. Herkowski Stickler & Associates (HSA) formerly Deery-Pardue & Associates, Inc. represents leading manufacturers in the Plumbing industry. In the design stage of a plumbing system HSA works with engineers to help design the system and write proper specifications. In the bidding stage we provide contractors with accurate and competitive quotations. In the build stage we provide contractors with the material they need when they need it.