AquaMatic K520-P Adapter 1/2-Inch NPT Threaded (Pair)

Ensure reliable, heavy-duty plumbing connections and simplify your manifold installations with the Genuine AquaMatic K520-P NPT Threaded Adapter Pair (SKU: 1079548). Manufactured by AqMatic (formerly Pentair), this set of two high-quality plastic piping adapters is specifically engineered for 1/2-Inch K520 Series Composite Body Diaphragm Valves.

Featuring a standard National Pipe Thread (NPT) configuration, these adapters allow you to securely screw standard 1/2" male threaded pipes, fittings, or instrumentation directly into your AquaMatic control valves. They are ideal for commercial water softeners, chemical dosing systems, and industrial water treatment skids that rely on robust, threaded plumbing connections.

⚠️ Important Compatibility Requirement

Please Note: To successfully fit and secure the K520-PC adapter faces to the valve body, you will need matching union nuts. Depending on your valve configuration and material preference, you must pair these adapters with either the K520-109 or K520-111 Retaining ring adn nut assembly. Ensure you have these components on hand to complete your installation.

Key Features & Benefits

• Standardized 1/2" NPT Threads: Precision-molded female NPT threads ensure a reliable, leak-free mechanical seal when paired with high-quality thread sealant or PTFE tape.

• Corrosion-Resistant Composite Material: Manufactured from high-grade, glass-filled thermoplastics (PVC/Noryl blend) that withstand aggressive water chemistry, acids, caustics, and harsh industrial environments.

• Convenient Union Design Interaction: Works in tandem with the K520 valve's signature union-style end connections, allowing for quick valve removal or isolation for servicing without cutting or dismantling the main piping manifold.

• Sold as a Complete Matching Pair: Every package includes two threaded adapters, giving you everything needed to plumb both the inlet and outlet ports of a single 1/2" K520 valve.

Comprehensive Kit Parts List

The K520-P Pack is supplied as a matching pair of plumbing connectors to outfit a single valve station. Each kit includes:

• 2 x 1/2" Female NPT Threaded Plastic Adapters (Item No. 19): The precision-molded threaded connectors that thread directly onto your system piping.

• 2 x Face O-Rings: High-durability sealing gaskets that isolate the joint face to ensure absolute, drip-tight performance under high line pressures.

• (Note: Companion Union Nuts like the K520-109 or K520-111 are sold separately).

Technical Specifications

Professional Installation Advice

When assembling threaded plastic connections, always use a high-quality PTFE thread sealing tape or a plastic-compatible pipe dope. Avoid over-tightening the male fittings into the female plastic NPT threads to prevent cracking the adapter body.

Hand-tighten the K520-109 or K520-111 union nuts onto the valve body first to ensure the face seals are completely square and seated properly before applying final mechanical leverage. If you need to perform internal valve repairs down the line, these union connections allow you to slip the valve out effortlessly. Remember to use the specialized AquaMatic 520-Z Assembly Tool for internal component servicing to avoid damaging the composite body threads.