Vessel O-Ring for A & M Composites 4″ Reverse Osmosis Pressure Vessels. Fits externally on the gray Feed Plug p/n ROEC033 or Permeate/Concentrate plug p/n ROEC032.
NOTE: Also known as Culligan p/n 00-4490-39 for FT-30 Adapter on M Series Reverse Osmosis RO Module Housing 1986-Present
