1,Pipe thread in accordance with ANSI B2.1, BS 21 1973, DIN 259/2999 2,Blow-out proof stem/Reduce bore 3,Investment casting body and screwed 4,800 PSI (55 BAR) W.O.G./1000 PSI (69 BAR) W.O.G. 5,Materials: ASTM-A351-CF8M, ASTM-A351- CF8 Special properties: 1.Produced from investment casting through in-house lost wax process foundry; 2.Schedule 40,150 pound; 3.Thread-test prior to shipment; 4.Pneumatic pressure testing is performed on every fitting manufactured; 5.Material chemical composition analysis by spectrometer on every furnace before casting is strictly executed; 6.Unions are completely interchangeable; 7.No burrs are inside