Our PEEK Bulkhead Union is optimally designed to be thread directly through equipment housing to connect internal tubing to the outside. It is manufactured from biocompatible PEEK giving is excellent chemical resistance to virtually all commonly used solvents. It has an internal thread of 14-28. The Bulkhead Union includes a stainless steel nut/lock washer. It comes in Red, blue, black, green and natural. Brochure