Our extension assemblies feature #20 gage fiberglass insulated wire with flexible stainless steel armor. Solid #20 gage thermocouple grade wires are used for thermocouple types E, J, K, N & T. Extension grade #20 gage solid wires are used for types B, C, R & S. Standard length is 36 inches ±1 inch. Other insulation types are available.
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