Universal Valve Co Type 521DP 522DP Double Poppet Safety Valve OPW 12073

  For sale is a surplus Universal Valve Co. Type 521DP / 522DP
  Double Poppet Safety Valve.  1-7/8" Diameter internal threaded ends.
  Zinc plated, cast iron body and top.	Stainless steel spring, shaft
  and reset nut.  Buna-N seal.	NOTE:  These valves are believed to be
  unused / never installed.  Feel free to ask any relevant questions.

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