3/4 NPT BrassWeiss Instruments, Inc. ESS3575BS

Brand new By Weiss Instruments, part# ESS35-75BS, Fits a 3/4" NPT female fitting/bung. These are the larger type that has the 1/2" hole for the larger bulbs on the aquastats and what not for wood stoves boilers and solar storage tanks. Longer neck allows for insulation around the well head and the tank to help protect the switch or terminal box. very high quality thermowells!