The Val-Pak generic Anthony Apollo DE filter rear end bell set screw is designed for compatible applications where the rear-end hardware needs the correct retention fastener. Set screws are useful because they secure critical structural or alignment-related pieces that the larger assembly depends on to stay properly fitted together.This replacement is especially useful when the original set screw is stripped, corroded, missing, or simply not worth trusting during reassembly. Refreshing the correct hardware can make the difference between a filter that feels properly rebuilt and one that feels like it was put back together with whatever was on hand.The V34-123 is a practical service detail for rebuilds that take the internal hardware seriously instead of overlooking the small parts that hold everything together. Val-Pak generic Anthony Apollo DE filter rear end bell set screw Designed for compatible rear-end hardware retention Useful when the original screw is stripped, corroded, or missing Helps restore secure assembly fit in the end-bell section Supports more complete and careful rebuild work