1-1/4" Brass Circulator Flange with Ball Valve, Less Drain.

Webstone® H-50405 Isolation Flange – 1-1/4", 5040 Series

The Webstone® H-50405 1-1/4" Isolation Flange from the 5040 Series is engineered to streamline circulator pump installations in hydronic heating systems. This forged brass valve combines a full-port ball valve and pump flange into a single, compact, high-performance component. Designed to eliminate unnecessary fittings and minimize leak paths, the H-50405 provides field-proven reliability and efficiency for demanding job sites.

Professional-Grade Performance for Pump Isolation

This isolator flange is ideal for 1-1/4" copper piping systems and circulator pumps with a 2-bolt flange connection. The full-port internal design ensures unrestricted flow of water or glycol-based fluids, supporting system efficiency and performance. With a blowout-proof stem and serviceable packing gland, the valve is engineered for long-term durability and safe operation under pressure.

Key Features

• Forged Brass Body – Built for corrosion resistance and long service life in closed-loop heating systems.
• Full-Port Ball Valve – Maximizes flow capacity and minimizes restriction across the valve.
• Blowout-Proof Stem – Prevents stem ejection and improves safety during pressure fluctuations.
• Adjustable Packing Gland – Allows for in-field stem adjustments and resealing as needed.
• Integrated Design – Combines pump flange and shutoff valve, reducing installation time and potential leak points.

Technical Specifications

• Model: H-50405
• Series: 5040 Series
• Nominal Size: 1-1/4 inch
• Connection Type: Sweat (C) x Flange
• Pressure Rating: 600 PSI WOG
• Temperature Range: Up to 250°F
• Inlet to Outlet Length: 3-1/8 inches
• Top to Inlet Center: 2-13/16 inches
• Sealing Material: PTFE seat and stem seal
• Warranty: Manufacturer’s Limited Lifetime

Installation Considerations

Designed for soldered copper systems, this isolation flange should be installed by trained plumbing or HVAC professionals. Proper torque and alignment with the circulator pump flange are essential to prevent leaks. The built-in valve eliminates the need for separate isolation shutoffs, making service and pump replacement faster and more efficient.

Jobsite-Ready Reliability

The Webstone H-50405 is built to meet the expectations of experienced contractors who demand rugged, time-saving components on every installation. Its all-in-one design reduces the number of parts in the field, lowers the risk of callbacks, and contributes to cleaner, more efficient system layouts.