You are purchasing one each new 10 inch conflat to NW250 adapter manufactured by Norcal Products. The large NW flange is commonly referred to as an EVAC flange and is a quick connect flange utilizing a chain clamp and a metal seal. EVAC calls this sealing system CeFIX. It consists of a rectangular cross section metal gasket compressing in a 20 degree sloped recess, like a conflat with the knife edge removed. See EVAC and other manufacturers websites for sealing and clamp options. This item is unused, untested and being sold as-is. We will combine purchases to save the buyer on shipping costs. Please look at our other listings for more adapters, flanges and vacuum hardware.

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