Openchannelflow - Fiberglass Packaged Metering Manholes (PMMS) Brochure

Openchannelflow fiberglass Packaged Metering Manholes (PMMs) solve the difficult problem of how to measure piped flows below grade.  Starting with our industry leading fiberglass manhole tube, Openchannelflow integrates a flow device, cover, base, and access ladder.