Attributes . Machined components are manufactured using solid bar stock. Steel nipples are hardened to provide resistance to brinelling during impulse service. Has Nitrile-Energized PTFE valve seals, with a temperature range of -40? to +250?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