Schematic Piping Diagram for OK-4625-74 DNE-3E Units.
Chicago: Vapor Heating Corporation. 8vo (when folded). Approx. 2' x 3' schematic of a Vapor Heating Corp. water heater; folded to 8vo size. Yellowed and very slightly soiled, with some signs of wear at creases and previous owner's notations in checklist box. Otherwise in excellent condition. Numbered diagram, with a key for valves, controls, and appurtenances. Very Good Paper (Item ID: 116332)