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 coupler 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