a novel reusable plastic drum container assembly and a process for installing a fitting - receiving member in an opening provided in a drum head wherein the opening is formed by a cylindrically - shaped neck member having an outer sloping surface including a circularly - shaped indentation portion extending perpendicularly from top surface of the drum head and wherein the fitting - receiving member in cross - section is of an inverted u - shape having an inner cylindrically - shaped portion , a circularly - shaped base portion , and an outer cylindrically - shaped leg portion defining a channel and is disposed over the neck member of the drum head with an electromagnetic bonding material fused between the outer surfaces of the neck member and the interior surfaces of the fitting - receiving member .