Rol-Air K18RINGS Ring Set for the PMP12K18 pump is a piston-ring kit designed to replace the three rings in the K18 piston assembly. The kit includes the compression ring (31201330CH), scraper ring (31201340CH), and oil ring (31201350CH) used in PMP12K18 installations. Listed as Ring Set (16, 17, 18) in Rol-Air's PMP12K18 parts list (K18RINGS), this ring set is intended specifically for Rol-Air PMP12K18 belt-drive, single-stage pumps.
