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The Vapor Reduction Device (VRD) was developed for use by Coast Guard Strike Teams during emergency transfer of liquid hazardous chemicals and petroleum products. The device is intended to be placed around and over deck openings which are being used for cargo offloading in order to reduce vapors which might degrade protective clothing or other equipment used on deck by Coast Guard Strike Team personnel. Various design concepts were evaluated prior to the prototype selection. Materials used in the design are compatible with lists of chemicals which adequately represent those in the Chemical Hazards Response Information System (CHRIS) manual. The device can be used over a variety of deck openings from 12-1/2 inch diameter flush deck Butterworth openings to raised cargo hatches with coamings 30 inches in diameter and 48 inches in height. The top section is designed to provide a seal around Air Deliverable Anti-Pollution Transfer System (ADAPTS) hoses and allows the pump system to be inserted or withdrawn without removing the VRD. Preliminary tests to measure the effectiveness of the VRD conducted at CGR&DC showed that the device has the capability of limiting the vapor concentration level around a tank opening to one (1) ppm when tested under the simulated conditions described in this report. (Author)