The Val-Pak generic AquaFlo Dominator lock ring is designed for compatible applications where the retention hardware securing part of the assembly needs to be replaced with the correct locking component. Lock rings are useful because they help hold the assembly together with the kind of consistent retention that allows the pump to operate and be serviced with confidence.This replacement is especially useful when the original ring is cracked, distorted, worn, or no longer engages with the authority it once had. In many repairs, replacing a tired lock ring makes the difference between an assembly that merely goes back together and one that actually feels secure once tightened down.The 91920050 is a practical service part when the goal is a more complete and confidence-inspiring Dominator rebuild. Val-Pak generic AquaFlo Dominator lock ring Designed for compatible assembly-retention applications Useful when the original ring is worn, cracked, or distorted Helps restore secure locking engagement Supports a cleaner and more dependable finished repair