Abstract: A pressure tank blank made of a thermoplastic, having a body, which merges via a shoulder into a neck and a mouth, which is implemented for screwing in a valve, is usable for gases under high pressure, if the blank has a metal insert enveloped by the plastic on the interior to reinforce at least the shoulder of the blank. This pressure tank blank may be produced in an extrusion blow-molding method. For this purpose, with open blow mold, a metal insert having the inner contour of at least the shoulder of the blank is introduced into the corresponding area of the cavity of the blow mold and the tube, enclosing this metal insert, is extruded into the blow mold, before it is closed.