Check the listing for details. 4" Stainless Steel 304 Filter Plate Retaining Ring Fits Spool with Tri-clamp. Condition: New. Listed at 12.99 USD. [Size]: 4". O.D.: 96.6mm. I.D.: 80.6mm. Thickness: 8mm. [Quality Materials]: The Retaining Ring is made of high quality 304 stainless steel, which is durable, stable, rust and corrosive resistance and good for long time using. [Precise Design]: The Retaining Ring is designed to fit with 4 inch spool with tri-clamp, the perforated plate holds the gasket in place and prevents any screen displacement. [High Working Temp. & Wide Range of Applications]: The filter plate ring allows the user to stack different levels of filtration inside their system. It is suitable for different media including water, gas, and oil with working at -58°F~392°F. [Convenient organization and storage]: Packed in a plastic bag with label.