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  2. Hard suction hose - Wikipedia

    en.wikipedia.org/wiki/Hard_suction_hose

    5-inch (13 cm) flex suction hose with Storz fittings, mounted on an engine. Flexible suction hose (Flex suction or suction hose), not to be confused with hard suction hose in U.S., is a specific type of fire hose used in drafting operations, when a fire engine uses a vacuum to draw water from a portable water tank, pool, or other static water source.

  3. Fire hose - Wikipedia

    en.wikipedia.org/wiki/Fire_hose

    Pressure testing the hose. Standards set by the National Fire Protection Association require that each length of new double jacket, rubber-lined attack hose must be pressure tested to 600 psi (41.4 bar; 4,140 kPa), but most manufacturers test to 800 psi (55.2 bar; 5,520 kPa). Subsequent to delivery, the hose is tested annually to 400 psi (27.6 ...

  4. EPDM rubber - Wikipedia

    en.wikipedia.org/wiki/EPDM_rubber

    Idealized EPDM polymer, red = ethylene-derived; blue = propylene-derived; black = ethylidene norbornene-derived. EPDM rubber (ethylene propylene diene monomer rubber) [1] [2] [3] is a type of synthetic rubber that is used in many applications.

  5. Birmingham campaign - Wikipedia

    en.wikipedia.org/wiki/Birmingham_campaign

    Birmingham, Alabama was, in 1963, "probably the most thoroughly segregated city in the United States", according to King. [8] Although the city's population of almost 350,000 was 60% white and 40% black, [9] Birmingham had no black police officers, firefighters, sales clerks in department stores, bus drivers, bank tellers, or store cashiers.