KNE Thermocouple Head Material: Alloy-Aluminum, SS304, SS316 Protection tube entry: PF1/2", PF3/4", NPT3/4", BSP1/2", BSP3/4", M20*1.5 Extension wire entry: PF1/2", PF3/4", NPT3/4", BSP1/2", BSP3/4", M20*1.5 Material of terminal block: Ceramic, Bakelite Form of terminal block: 2 poles, 3 poles, 4 poles and 6 poles Available Color: Silvery, Yellow, Red, Blue, Purple, Black Approval IEC529: IP65