Morrison Fig 305C Tank Monitoring Cap 5 7 16 Dia Fits 4 opw gas 13878

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  For sale is a Morrison Fig.305C Tank Monitoring Cap.	5-1/2" O.D.
  4-7/8" I.D. with face gasket.  Nominal size is marked on the cap as
  4".  NOTE: This tank cover DOES NOT HAVE A LOCKING PIN.