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    A kit to upgrade a City, Sportsta, or Nitesight mask to Techno mask performance
    The Features of the Respro City / Techno Upgrade Kit are:
    • Contains two Techno valves and one Techno gold filter

    • Also useful as a spare sub-assembly, to allow a mask in daily use to have the filter swapped over occasionally to allow it to dry out, which will extend its life

    • Universal shell size fits 54 - 61 cm head sizes