3/4" Brass Circulator Flange with Ball Valve, and Drain, Sweat

Webstone® H-50413 3/4" Isolator Flange with Drain – 5041 Series

The Webstone® 5041 Series H-50413 Isolator Flange provides a compact, efficient solution for circulator pump installations in closed-loop hydronic heating systems. This forged brass isolation flange integrates a full-port ball valve and high-flow hose drain into a single unit—streamlining system maintenance, reducing labor time, and eliminating multiple connection points that can lead to leaks.

Designed for Serviceability and Efficiency

The H-50413 simplifies pump installation and replacement by providing easy in-line isolation and integrated draining without the need for separate components. Its uni-body construction eliminates up to six fittings and five potential leak paths, resulting in faster installs and more reliable long-term performance. The precision-machined flange face ensures compatibility with standard 2-bolt circulator pumps.

Key Features

• Forged Brass Construction – Delivers durability and corrosion resistance for long service life in heating systems.
• Full-Port Ball Valve – Provides unrestricted flow with minimal pressure drop.
• Hi-Flow Hose Drain – Enables rapid system draining or purging via standard hose thread outlet.
• Blowout-Proof Stem – Increases operational safety under pressure.
• Conical Inlet Geometry – Reduces turbulence and enhances flow efficiency at the pump inlet.
• Slotted Bolt Holes – Accommodates alignment flexibility, especially for high-velocity pump connections.

Technical Specifications

• Model: H-50413
• Series: 5041
• Nominal Size: 3/4 inch
• Connection Type: Sweat (C) x Flange
• Pressure Rating: 600 PSI WOG
• Temperature Range: Up to 250°F
• Inlet to Outlet Length: 4 inches
• Top to Inlet Center: 2-1/4 inches
• Sealing Material: PTFE seat and stem seal
• Warranty: Limited lifetime (manufacturer)

Installation Considerations

This isolation flange is designed for use with 3/4" copper piping and standard circulator pump bolt patterns. Installers should ensure correct soldering technique and gasket alignment for a leak-free connection. Proper torque should be applied to the flange bolts as specified by the pump manufacturer. The built-in drain makes service tasks such as pump swaps or loop purging faster and cleaner.

Built for the Demands of the Trade

Trusted by HVAC and plumbing professionals, the Webstone H-50413 delivers robust performance and installation efficiency. Its integrated valve and drain system minimizes materials, labor, and callbacks—making it a reliable choice for residential and light commercial hydronic heating applications.