Backflow Assembly Sizing Screen
Hazard-driven assembly selection (RP required for any high / health hazard per IPC 312), head loss at design flow from the bundled assembly curves, the pressure remaining downstream, and the EPA 40 CFR 141.85 / AWWA M14 annual-test reminder.
Audience
This tile is built for plumbers and the adjacent professions in the Plumbing and Gas group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.
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Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.