Screw Plug Immersion Heaters is screwed directly through a threaded opening in a tank wall or through a matching pipe coupling or half coupling. Sizes of screw plug heaters are
 available with 1”, 1-1/4”, 1-1/2”, 2”, 2-1/2" pipe threads. A wide selection of screw plugsizes, kilowatt ratings, voltages, sheath materials, terminal enclosures and thermostats makes these compact heaters ideal for all types of applications.