The Pouch Post is used to position the tip of the flexible Pouch Thermocouple in the center of the pouch. The post is made of 3/8" diameter Teflon with sealing screws/gaskets on each end. The design enables you to fit the tip of the pouch thermocouple through the spacer to position it properly. A set-screw allows you to secure the flexible pouch thermocouple wire in the post. Please designate the length of the post.