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The AQUALINE FP-CAP15 is a 1.5-inch female national standard thread (FNST) brass cap with attached chain, designed to protect threaded hose connections from debris, damage, and unauthorized use. The cap threads onto standard FNST fittings and is commonly installed on pool and spa equipment, irrigation systems, and outdoor water supply connections. The brass construction provides corrosion resistance suitable for wet environments. The attached chain keeps the cap secured to the fitting when removed, preventing loss during routine service. This fitting is typically installed by pool service technicians and plumbers.
This cap is suited for residential and light commercial pool, spa, and irrigation applications where a 1.5-inch FNST threaded connection requires protective capping. It is commonly used on pool vacuum ports, fill line connections, and similar threaded outlets that are accessed periodically during maintenance. The chain attachment is a practical feature in field service scenarios where small caps can be misplaced.
Designed as an OEM-style replacement or service cap for 1.5-inch FNST threaded fittings commonly found in residential pool, spa, and irrigation plumbing systems.
Installation is performed by pool service technicians or licensed plumbers. Shut off water supply and relieve system pressure before removing or installing threaded caps. Hand-tighten to seal; avoid over-torquing brass fittings to prevent thread damage. Follow applicable local plumbing codes when servicing pool or irrigation systems.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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