This is a JIC double nipple with UNF threads. Zinc-coated steel fittings provide some corrosion resistance, but are not meant for corrosive environments. The maximum operating pressure is 210 bar (2950.5 psi).
Specifications
Thread : UN 1-1/16-12
Thread (smaller) : UNF 3/4-16
Dash Size : 12
Dash Size (smaller) : 8
Connection type : Outer thread flare (UNF)
Material : Steel
Max pressure at 20 °C (bar) : 210
Fitting features : Reducing
Material connection 1 : Steel
Material connection 2 : Steel
Shape : Straight
Surface protection connection 1 : Galvanic zink plated
Surface protection connection 2 : Galvanic zink plated

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