1" Brass Circulator Flange with Ball Valve, and Drain, Female, Iron Pipe x Iron Pipe

Webstone® 1" Isolator Flange with Drain – H-40414 | 4041 Series

The Webstone® H-40414 Isolator Flange is a 1" forged brass circulator flange with an integrated full-port ball valve and high-flow hose drain, designed for use with hydronic heating pumps. Engineered to combine multiple functions into a single, compact body, this 4041 Series isolator saves labor, eliminates potential leak paths, and improves system serviceability.

Engineered for Performance and Time Savings

Constructed from corrosion-resistant brass and precision-machined for standard circulator compatibility, this isolator flange eliminates the need for separate ball valves, hose bibbs, and associated fittings. A blowout-proof stem and PTFE seat/stem seal ensure leak-free operation under pressure. The integrated drain port allows for easy purging or flushing without additional connections.

Key Features

• Forged Brass Body – Durable, dezincification-resistant material suitable for hydronic system demands.
• Full-Port Ball Valve – Maximizes flow with minimal pressure drop across the valve.
• Hi-Flow Hose Drain – Facilitates quick draining or system fill with a standard garden hose thread outlet.
• Uni-Body Design – Replaces six fittings and eliminates five potential leak points, reducing installation time by up to 45 minutes.
• Blowout-Proof Stem – Prevents stem ejection and enhances valve reliability under system pressure.
• Adjustable Packing Gland – Allows in-field resealing and maintenance over the service life of the valve.
• Conical Inlet Design – Improves flow efficiency and reduces turbulence to the pump.

Technical Specifications

• Model: H-40414
• Series: 4041 Series
• Nominal Size: 1 inch
• Connection Type: IPS x Flange
• Pressure Rating: 600 PSI WOG
• Temperature Rating: Up to 250°F
• Inlet to Outlet Length: 4-3/16 inches
• Seal Material: PTFE seat and stem
• Warranty: Limited Lifetime (manufacturer)

Installation Guidance

Designed for use with 2-bolt circulator pumps, this isolator flange installs directly in-line with minimal space requirements. Professional installation is recommended to ensure proper alignment, torque specifications, and code compliance. The integrated valve and hose drain significantly reduce the need for additional fittings and service points, supporting faster jobsite turnover.

Built for the Demands of the Trade

Trusted by contractors for its durability and time-saving design, the Webstone H-40414 is ideal for both new construction and retrofits in hydronic heating systems. Whether you're upgrading a residential pump or assembling a multi-zone loop, this isolator offers the reliability and simplicity professionals require on the job.