Nibco h-41403whv Pump Isolation Valve 3/4 Inch Fpt

Product Description

The NIBCO h-41403whv is a 3/4-inch female pipe thread (FPT) pump isolation valve with a rotating flange designed for hydronic and plumbing pump service. This valve allows technicians to isolate a circulator or inline pump from the system without draining the entire loop, simplifying pump removal and replacement. Constructed to lead-free standards, it meets drinking water compliance requirements where applicable. The rotating flange feature speeds alignment during installation and reduces the risk of cross-threading. Licensed plumbers and HVAC hydronic technicians install this valve as part of standard pump serviceability practice.

This isolation valve is suited for residential and light commercial hydronic heating systems, domestic hot water recirculation loops, and plumbing systems where pump serviceability is a priority. It is installed directly at the pump inlet or outlet connection, providing a shutoff point that keeps the system charged while pump work is performed. The 3/4-inch FPT connection is a common size for residential circulator pumps.

Key Features

• 3/4-inch FPT threaded connection for direct pump port attachment
• Rotating flange design allows repositioning during bolt-up without relocating the valve body
• Lead-free construction meets applicable potable water safety standards
• Isolation flange configuration enables pump removal while system remains charged
• Compact form factor suited for tight mechanical room installations

Compatibility

Designed as an OEM-style replacement and new-installation isolation flange for 3/4-inch FPT pump connections in residential and light commercial hydronic and plumbing systems.

Installation Notes

Installation is performed by a licensed plumber or qualified HVAC hydronic technician. Shut off system flow and relieve line pressure before threading the valve onto the pump connection. Apply thread sealant or PTFE tape appropriate for the service fluid and temperature range. Verify all flange bolts are drawn evenly to prevent flange distortion and ensure a leak-free seal before returning the system to service.

Technical Specifications

• Connection Type: 3/4 inch FPT (Female Pipe Thread)
• Flange Style: Rotating flange
• Lead Free: Yes

Standard Information

• Brand: NIBCO
• Manufacturer Part Number: h-41403whv