Resilient nitrile-butadiene rubber seal ring is mounted.
It is recommended for cement filling, fracturing, acidizing, testing and choke and kill line. It is designed for high-pressure systems including truck-mounted system. Also, it may be used as pressureless seal union. Butt weld Sch. 160 or XXH is desired.

For figure 1002, 10000PSI NSCWP, test pressure at 15000PSI with red nut and blue parts.
Figure # 1002 union may also be used in applications with H2S and other acid gases.