Malleable iron union, available with female/female or male/female threads.
All female threads are BSPP. All male threads are BSPT.
Available in standard (also known as Figure 340) and Flat seat type (also known as Figure 330) which has a PVC seal.
Figure 330 unions are preferred over the standard Figure 340 unions in high temperature and chemical processing applications due to their superior heat resistance and corrosion resistance.