A bung plug closure for bung-hole containers includes a bung plug for being placed in a bung neck and a seal cap for closing a plug recess formed in the bung plug, the plug recess having a space for receiving a dimensionally elastic engaging body formed on the seal cap and having a radial locking protrusion, a valve disposed in a bottom of the plug recess, the valve having a valve body disposed in a valve opening of a bottom recess, the valve body including a valve cover connected to the bung plug, the valve cover being an elastically deformable disk, the valve cover connected to the bung plug such that a circumferential edge of the valve cover, which protrudes radially outward over matching locking elements for interlocking with the locking protrusion, is received between the locking protrusion of the engaging body and a recess edge of the bottom recess.