Premium quality membranes available in EPDM, urethane, or special polymer blends, plus Matrix technologies for reduced fouling and maintenance. Highest diffuser area density for maximum OTE performance up to 65% floor coverage. NanoPoreTM and MicroPoreTM perforations for engineered for OTE and operating pressure requirements. Mounts to 4-inch, 6-inch, 8-inch, 110-mm, and 160-mm pipe sizes. Non-buoyant design for reduced stress on mounting connection. ABS and PVC construction for maximum chemical, temperature, and UV resistance. Nominal 4.75-inch (121 mm diameter) x 54-inch (1359 mm) length for a total active membrane area equal to 380-inch2 (0.245 m2) per ARM.