Attributes . Machined components are manufactured using solid steel bar stock; Stainless steel retaining rings and springs maximize corrosion resistance and extend service life. Steel componentry is plated using ROHS Compliant Zinc Nickel for superior corrosion resistance. Valve stems have molded Polyurethane seals, with a temperature range of -65?F to +212?F (-54?C to +100?C); Ancillary nipple seals are Nitrile (Buna-N), with a temperature range of -40?F to +250?F (-40?C to +121?C); TPC-ET Anti-Extrusion ring protects main coupling valve seal from dynamic impulse pressure damage; . Names