A.B. Duffy, Inc. has been providing the highest quality custom-fabricated equipment and related metal fabricating services to industrial clients in the Delaware Valley area since 1951. In 1958 we became an authorized fabricator of ASME Code “U Stamp” Unfired Pressure Vessels. We maintain a full-service fabricating facility and the capability to fabricate and weld steel, stainless steel and non-ferrous alloys.