new old stock in original box vintage glass chimney Eimac SK 416 vacuum tube cover

New old stock vintage Eimac SK-416 chimney for a large vacuum tube, as shown. This came to me with some farm estate hardware and equipment - I have no idea about the piece (s) that might use this part, so please email me if you need any more info. It's in excellent condition with it's original packing material still in the box.