Used on reverse osmosis/demineralizer; water purification unit model 10500rodm; arleigh burke class ddg. 5.000" center hole diameter retaining ring, resin separator screen assembly ring contains 8 holes equally spaced; 0.281 inch diameter
Used on F4. 0.620" center hole diameter back-up ring, rod type, non-radiused, sto, scarf angle item is made from nwr:wear resistant nylon, per gts-0020