Waterway | 519-7441 | Gauge Lock Nut – OEM Replacement for Filter Systems

The Waterway 519-7441 Gauge Lock Nut is a genuine OEM replacement fastener used to secure the pressure gauge on Waterway filters and related equipment. Designed for durability and a precision fit, this lock nut ensures a watertight seal and proper alignment of the pressure gauge, preventing leaks or gauge loosening during system operation. Made from high-strength, chemical-resistant materials, it provides reliable performance in harsh pool and spa environments. Ideal for filter maintenance or gauge replacement, this part restores the original fit and function of your Waterway system.

Key Features

• OEM Replacement Component: Direct-fit lock nut designed for Waterway filters, ensuring secure installation and compatibility with factory gauge threads.

• Durable Plastic Construction: Built from high-quality, corrosion-resistant material capable of withstanding long-term exposure to pool chemicals and UV light.

• Watertight Seal Design: Provides a snug fit around the gauge base to prevent leaks and maintain consistent pressure readings in your filtration system.

• Easy Installation: Simple threaded design allows for quick replacement without tools, saving time during regular maintenance or gauge servicing.

• Universal Compatibility: Fits a range of Waterway filter and valve assemblies that use standard threaded pressure gauges.

Product Overview
The Waterway 519-7441 Gauge Lock Nut is a small but critical component for maintaining the accuracy and reliability of your filter system’s pressure gauge. When this nut becomes cracked, worn, or stripped, it can lead to loose fittings or water seepage at the gauge connection, causing inaccurate readings or system inefficiency. This OEM replacement part ensures the gauge remains firmly in place and properly sealed against the filter body or valve head, preserving system integrity and measurement accuracy.

Constructed from durable, pool-grade plastic, the 519-7441 resists degradation from constant chemical exposure, temperature variations, and UV radiation. Its precision threading ensures a tight fit that won’t back off under pressure or vibration. Installation is straightforward—simply thread the lock nut over the gauge stem to secure it in place, restoring original system performance.

Perfect for pool professionals and maintenance technicians, this part is an affordable and essential addition to any Waterway filter repair kit. For online listings, it belongs under “Pool Filter Replacement Parts – Gauge Components & Fittings”, highlighting its OEM build quality, chemical resistance, and simple installation for consistent, leak-free operation.