Pentair Lock Spring

The Pentair Lock Spring (part number R172374) is a small but vital mechanical component engineered to maintain the structural safety and operational integrity of Pentair Rainbow high-capacity automatic chemical feeders—including models HC-3315, HC-3330, and HC-3340—as well as the Dynamic Series II, III, and V (RTL/RCF and DSC) pool and spa cartridge filtration systems. Fabricated from premium, corrosion-resistant spring steel, this piece is designed to provide continuous tension against the locking ring or lock screw mechanism. Its primary function is to prevent the filter or feeder lid from backing off or loosening dynamically due to continuous hydraulic pressure and system vibrations. Measuring just under two inches in length, this precise hardware component has an actual product weight of approximately 0.01 pounds (about 0.16 ounces), rendering it an incredibly lightweight yet structurally critical fastener for preventing chemical or water leaks in high-pressure aquatic environments.