What is the lowest PSI loss RPDA Backflow that anyone has found in 6" and 4". I'm doing several jobs here in the Keys that I need to feed residential buildings and Ordinary GP 1 situations. Per Florida Keys Aqueduct Authority, all Backflows must be RPDAs and have Os&Y Gates. I like and have used the Derringer but they are almost up to 12 PSI loss at residential flow levels. Thanks in advance, John Farabee | Certified Lower Keys Plumbing and Fire | C: 561-707-5150 | F: 305-294-2462
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