BT base metal thermocouple is a replacement element for Industrial BW style assemblies andProtection tubes.  Available in ASTM E 230 type J or K, 8, 14 or 20 AWG gauge.  Choose from twisted or butt welded junctions, single or dual element, round, oval insulators or without ceramic insulators.  Capable of temperatures up to 2300°F (1260°C).