Replacement P6119 (also called P6119ASS16) o-rings for Bestway Flowclear Filter Pumps (Filter Cap Cover). (2 Pack) Includes two P6119 o-rings. The P6119 o-ring measures just under 5” inside diameter and 0.210” thickness. Compatible with pump model numbers: 58117, 58118, 58122, 58123, 58148, 58149, 58383, 58384, 58384E, 58386, 58388E, 58389, 58122GS, 58388E, 58389GS, 58390E, 58664E, 58758E, 90473E. Check your filter model numbers on the side of the filter to confirm it matches one of the compatible models. Captain O-Ring LLC produces several different size o-rings for BestWay pumps, filters, and other equipment. Please check your system's user manual to confirm that it calls for this part number to ensure you order the correct o-ring size. If you're not sure, please contact Captain O-Ring LLC and we'll be happy to help determine the correct o-ring part number/size so you can get it right on the first try and get your system back up and running! Manufactured and warrantied by Captain O-Ring LLC. Assembled in the USA!