Val Pak Generic AquaFlo Dominator Lock Ring (91920050) gentekk giving homeowners a more capable giving homeowners a more capable replacement option when the original pack no longer feels dependable and this Balboa Microssage Trim and Gunite Fitting Spinner is designed for compatible white finish applications where the original unit has become worn or less lively 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 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