This is a JIC closing plug with an external hexagon. Zinc-coated steel fittings provide some corrosion resistance, but are not meant for corrosive environments.
Specifications
Thread : UN 1-5/16-12
Dash Size : 16
Connection type : Outer thread JIC
Material : Steel
Max pressure at 20 °C (bar) : 170
Material connection 1 : Steel
Surface protection connection 1 : Galvanic zink plated

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