ALFANO A2151 EGT "K" Sensor - 40cm "Professional quality, red label". This sensor is of thermocouple K technology and must be installed correctly in to the exhaust pipe. We can supply the Boss A272A and A272B Read the explanation on the installation and use of this sensor, this document can be found under the heading Documents Note: this sensor must be used with an extension cable ref. A3401 or a hub ref. A2190. Can be used in Rotax Max, X30, KZ and Superkarts. Also in any 2 stroke exhaust on Bikes, Powerboats etc.