Lot of 3 national electronics nl-5551A ignitor tubes

What is for sale: Lot of 3 national electronics nl-5551A ignitor tubes

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Lot of 3 National Electronics NL5551A Ignitor Tubes. These Tubes are used.
Link to the data sheet: http://catalog.rell.com/rellecom/Images/Objects/6400/6352.PDF
National Ignitron NL-5551A is a stainless-steel jacketed, water-cooled, mercury-pool tube designed especially for welder control and similar AC control application. Its rating is approximately equivalent to a 300 ampere magnetic contactor.
NL-5551A has a copper thermostat mounting plate atttached to the outside cylinder of the tube in such a manner that it makes thermal contact with the inner cylinder. The temperature of this copper plate is esentially the same as that of the inner cylinder and is slotted so that it can accomodate the standard ignitron thermostat mounting. This plate can be used either for the protection or the water-saver thermostat. One each of these thermostats mounted on a pair of these ignitrons can provide both protection against over heating and water saving.