Air Gap Backflow Preventers with Proportioners

Air Gap Backflow Preventers with Proportioners DEMA offers an Action Gap and Air Gap back flow preventers to meet virtually any plumbing requirement. The 16-30 Action Gap backflow preventer attaches to a 1, 2.5 or 4 gpm (4, 10 or 15 L / min.) proportioner to achieve the best flow for the particular application. DEMA’s Air Gap has a built-in proportioner and is available with either 1 or 4 gpm (4 or 15 L / min.) flow rate.