Attributes . Machined components are manufactured using solid bar stock; Steel nipples are hardened to provide resistance to brinelling during impulse service. Has molded Polyurethane valve seals, with a temperature range of -65? to +212?F; Ancillary nipple seals are Nitrile (Buna-N), with a temperature range of -40?F to +250?F; PTFE or TPC-ET Anti-Extrusion ring protects main coupling valve seal from dynamic impulse pressure damage. . Names