Separable sockets are used to provide pressure tight connections where required. They also offer the advantage of allowing a thermometer to be removed from a system without disturbance. The thermometer is inserted and tightened to the separable socket by means of a threaded swivel nut coupling. Quick response to temperature changes is assured since the stem and socket are precision tapered, providing a metal to metal contact at the sensitive bulb section. This thermowell is made of brass with a 3-1/2 stem length, 2-1/2 insert length and 3/4" NPT.