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The Backflow Direct 4-inch Deringer 20 (DC) is the shortest, lightest backflow preventer around. Its lay length is just 18.7 inches and it weighs only 42 pounds, making shipping and installation easy and efficient. The valve housing is constructed entirely of 304 stainless steel and the Deringer has two integral shutoff valves with pre-wired supervisory tamper switches. It is ASSE and USC approved and available at www.BackflowDirect.com.