Valve stem seals with part number 16-72891 on packaging

pnsmum VALVE STEM SEALS Included in this package . . r vaNe Modem engines run at high operating temperatures, Premium qua lty stem seals are required to prowde extenjed service life. look the same a: these Valve Stem seals fabricated from standard polymers - demandinu a llcatlnn. premium grade Seals, but Would not hold UP '" "5 ~ p F The premium als in this set may account for the difference in selling n. :0 v se between this FEL pqo set and competitive set containing standard pOlymer seals. SP 597