Legend Valve 105-111 Brass Inline Check Valve 4 in Fnpt

Product Description

The LEGEND VALVE 105-111 is a brass inline check valve sized for 4-inch pipe with female NPT connections on both ends. Check valves of this type allow fluid flow in one direction only, preventing backflow that can damage pumps, water heaters, and distribution equipment. The 105-111 is constructed from brass, which provides corrosion resistance in potable water and general plumbing service. At 9.5 pounds, this is a substantial fitting suited for commercial and industrial plumbing installations where a full 4-inch line size is required. Licensed plumbers and mechanical contractors are the primary installers of valves at this pipe size.

This valve is designed for inline installation on 4-inch plumbing lines in commercial, industrial, or large residential mechanical systems. The FNPT x FNPT end connections thread directly onto standard NPT-threaded pipe or fittings per ANSI/ASME B1.20.1. Typical applications include booster pump discharge lines, water main branch connections, HVAC hydronic systems, and any piping system where reverse flow must be prevented. The brass body meets ANSI/ASME B16.18 dimensional standards for cast copper-alloy fittings.

Key Features

• Brass body construction provides corrosion resistance for water and general plumbing service
• FNPT x FNPT end connections compatible with standard 4-inch NPT pipe and fittings
• Inline check valve design prevents backflow without requiring manual operation
• Meets ANSI/ASME B1.20.1 and ANSI/ASME B16.18 standards
• Full 4-inch line size for high-flow commercial and industrial applications

Compatibility

Designed as an OEM-style replacement or new-installation inline check valve for 4-inch FNPT-threaded plumbing systems conforming to ANSI/ASME B1.20.1 pipe thread standards.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and the International Plumbing Code (IPC). Shut off the water supply and depressurize the line completely before removing any existing fitting or installing this valve. Apply thread sealant or PTFE tape appropriate for the service fluid to all FNPT connections. Verify that the valve flow-direction arrow is oriented correctly in the line before making final connections.