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