Thermowell assembly is manufactured from 316l stainless steel with 32ra finish or better. It can be used with rtd temperature sensor. Includes polypropylene screw cap and silicone gasket. There are also tubes for addition media and vent. Thermowell assemblies attach to the sidearms with a screw cap assembly. Includes: screw cap and silicone gasket Stainless steel vent tube: 250"x152" Long tube: 1.0" above x 15 31/32" insertion Stainless steel tube: 5/16"x.225" x 1.0" x 15 31/32"