Abstract: In a method for reconditioning a returnable barrel of sheet metal, that is used initially as a bung barrel having a barrel wall and a top cover with a fill and discharge bung and fixedly connected to the barrel wall, and is to be reused as a lid barrel with a bung lid or bung-free lid connected to an outwardly rolled opening rim of the barrel wall via a clamping ring closure after removal of the top cover, wherein the barrel wall has an upper portion forming a barrel neck recessed or tapered relative to the outwardly rolled opening rim of the barrel wall, wherein the top cover of the initial bung barrel has a rolled outer rim placed on the outwardly rolled opening rim of the barrel wall and connected to the outwardly rolled opening rim by lock-seaming and welding, the top cover of the bung barrel is circularly cut concentrically to a longitudinal center axis of the barrel at a transition between a plate of the top cover and an upwardly extending inner rim of the top cover to separate the plate of the top cove

Abstract: A press-fitting connector for plastic composite pipes, comprised of an inner plastic layer, an outer plastic layer, and a middle metal layer, has a support member receiving the end of a plastic composite pipe. The support member has an outer collar having a first end face facing the plastic composite pipe and a second end face facing away from the plastic composite pipe. An insulating plastic ring is positioned at the first end face. A press-fit sleeve secures the pipe end on the support member. The outer collar has two diametrically opposed cutouts. The insulating plastic ring is a curved spring washer with two convexly curved and two concavely curved portions, wherein the convexly curved portions have monolithic, axis-parallel tongues engaging the cutouts of the circumferential rib. The axis-parallel tongues in the end position of the plastic composite pipe project partially from the cutouts past the second end face of the outer collar.