Nibco NL7500B Check Valve 1-1/4 in Y-pattern Fnpt 200 Wog

Product Description

The NIBCO NL7500B is a Y-pattern check valve designed for use in plumbing and mechanical piping systems where backflow prevention is required. Built with a bronze body and a nitrile butadiene rubber (NBR) seal, this valve provides reliable one-directional flow control rated at 200 WOG (water, oil, gas). The 1-1/4 inch pipe size and FNPT x FNPT end connections make it compatible with standard threaded pipe installations. Weighing 2.207 pounds, the NL7500B is a compact, durable unit suited for commercial and residential mechanical rooms, boiler systems, and general-purpose plumbing service lines. Licensed plumbers and pipefitters are the primary installers.

This check valve is intended for use in systems where preventing reverse flow is critical, such as domestic water supply lines, hydronic heating systems, and low-pressure fluid distribution. The Y-pattern body design offers lower pressure drop compared to traditional swing-style check valves, making it a practical choice in systems with continuous or variable flow. It is well-suited for installation in both horizontal and vertical pipe runs where the 200 WOG pressure rating meets system requirements.

Key Features

• Y-pattern body design for reduced pressure drop across the valve
• Bronze body construction for corrosion resistance in water and fluid service
• Nitrile butadiene rubber (NBR) seal material for compatibility with water, oil, and gas applications
• FNPT x FNPT end connections for standard threaded pipe installation
• 200 WOG pressure rating suitable for a broad range of low-to-medium pressure systems
• 1-1/4 inch pipe size for mid-range residential and light commercial piping

Compatibility

Designed as an OEM-style replacement or new-installation check valve for 1-1/4 inch threaded pipe systems rated at or below 200 WOG in plumbing, HVAC hydronic, and general mechanical piping applications.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and the IPC. Shut off system pressure and drain the line before removing an existing valve or making new connections. Use thread sealant or PTFE tape on all FNPT connections and avoid over-tightening, which can crack threaded fittings. Verify flow direction markings on the valve body before final assembly to ensure correct orientation.