The latest toroidal conductivity sensor from Sensorex is now available. Added features include Noryl construction, a keyed body and a molded mating CPVC flow cell which ensures proper direction and installation of the toroidal sensor. The flow cell is a 2" slip fit which can be reduced to accept required line size. An external retention nut and "O" ring seal provide for installation and removal without the need for tools. 

http://www.sensorex.com/support/specifications/download/TCS3000Series.pdf