Action Gap & Air Backflow Preventers and Proportioners


DEMA offers 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.