A fitting part includes a support part fastenable to the vessel wall of a boiling or frying vessel and comprises a grip part fastenable to the support part and fixed with a latching device, and a manual actuation element provided on the latching device for unlatching the latching device from a latched position, wherein a latching nib is provided on the support part and is gripped from behind by a complementarily formed latching projection of the grip part during downwardly direction tilting motion and fixes the grip part in position on the support part, wherein a motion guide element with a motion guide surface is provided on the actuation element, and the motion guide surface inclines at an acute angle obliquely against a linear travel path and glides on the contact area when the actuation element is displaced along the travel path.