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
