This is a JIC double nipple with M and UNF threads. Zinc-coated steel fittings provide some corrosion resistance, but are not meant for corrosive environments. The seal material is NBR. The maximum operating pressure is 275 bar (3863.75 psi).
Specifications
Thread : UNF 1/2-20
Thread (smaller) : M12 x 1.5
Dash Size : 5
Connection type : Outer thread metric,Outer thread flare (UNF)
Material : Steel
Seal material : NBR (nitrile rubber)
Max pressure at 20 °C (bar) : 275
Min temperature (°C) : -30
Max temperature (°C) : 100
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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