AquaMatic K521-P 1" NPT Threaded Adaptor (Pair) | Part 1070227

The AquaMatic K521-P Adaptor Kit (Manufacturer Part Number: 1070227) is a factory-original pair of 1-inch female NPT threaded adapters engineered exclusively for AquaMatic K521 Series composite body diaphragm valves.

This high-quality PVC grooved adapter kit is designed to provide a secure, heavy-duty threaded transition between standard National Pipe Thread (NPT) pipework or fittings and your K521 control valves. It allows for a clean mechanical installation that avoids the permanent nature of solvent welding, making it highly versatile for commercial and industrial plumbing layouts.

Important Connection Requirement: These adapters feature the specialized AquaMatic grooved flange profile and require either a K521-109 or K521-111 Retaining Ring and Nut Assembly to mechanically clamp and seal the adapter pair securely to the valve body ports.

Parts Included List

To complete a full valve installation, one kit is required per valve. This kit includes:

• 2 x K521-P 1" Female NPT Threaded Adapters: Precision-moulded PVC connectors featuring the specialized AquaMatic exterior grooved alignment profile on one side and standard 1" female NPT threads on the other.

Note: The required K521-109 or K521-111 retaining rings, nuts, and internal elastomer O-rings are sold separately.

Key Features & Benefits

• Versatile Threaded Transition: Connects your composite valve seamlessly to standard male 1" NPT pipe nipples, scheduled fittings, or stainless steel/brass pipework.

• Corrosion-Proof PVC Construction: Matches the excellent chemical-resistance profile of the K521 composite valve body—ideal for water softeners, DI water loops, and chemical handling.

• Robust Thread Profile: Precision-cut female threads ensure clean engagement and a high-integrity seal with minimal risk of cross-threading when using standard trade practices.

• Genuine OEM Tolerances: Manufactured by AqMatic / Pentair to rigorous industrial standards, ensuring perfect concentricity and a tight face seal.

Technical Specifications

Applications & Systems

The K521-P threaded adapters are ideal for installations where components or valves may need to be reconfigured, repositioned, or paired with metallic pipe headers. They are widely used in:

• Commercial water softeners and multi-media iron/carbon filtration systems.

• Commercial reverse osmosis pre-treatment and pure water distribution lines.

• Industrial boiler feed water conditioning and chemical injection systems.

Installation Note: Slide your chosen K521-109 or K521-111 union retaining nut and split ring onto the adapter before making your final connection to the valve body. When threading male pipe fittings into these PVC adapters, use a high-quality PTFE thread sealant tape or an approved plastic-safe pipe dope. Do not over-tighten the NPT joint, as excessive torque on tapered plastic threads can cause stress cracking over time. Turn hand-tight plus 1 to 2 turns with a suitable wrench.