This Pt100 RTD temperature sensor is for applications that need liquid tight seals such as beer brewing or biodiesel production. The probe body is made of stainless steel. The mounting is 1/4″ NPT thread. (it threads well into 1/4″ BSPP and BSPT too). This probe has a detachable connector with a spring lock. The detachable cable is convenient for systems that need to be moved for cleaning. It reduces the possibility of breaking the cable when the tank is moved around.