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Companies often have vendors change the part number slightly, to frustrate price matching policies. The "5" indicates the connected 40A amp version, a "6" would indicate the hardwire ready version. You can hard wire either one (hardwiring is recommended for most cases). The PUP1 is the older model, the PUP2 is newer, but they function similarly for residential use. See the attached part number guide uploaded as an image. A - PUP1 or PUP2 revision B- U indicates 25 ft cable C 1 indicates Type 1 cable D Here a 5 is for 9.6kW, and 6 for 11.5kW E See "O-Hardwire" "N-Plug in" F The only value is 002 for black G 'Revision', in other words packaging for a particular vendor.
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