Clippard Flat seal, 3/10 inch wide, for 10x32 lpr line fittings. I use these on 90s and straight fittings againsts Autococker Low pressure regulators and rams. The seal and the fitting need to have a flat to flat edge connection to seal correctly. This is the larger of two sizes I have in stock. OD is .295 inches. Inner diameter is .130 inches. One included, tons availabe.