A.y. Mcdonald 5420-198 Swing Check Valve 1/2 in Fpt 125 Psi

Product Description

The A.Y. McDonald 5420-198 is a 1/2 inch swing check valve rated for 125 PSI service. Check valves of this type use a hinged disc that opens under forward flow and closes automatically when flow stops or reverses, preventing backflow in the line. The 1/2 inch female pipe thread (FPT) connections on both ends allow straightforward threaded installation into standard pipe assemblies. At 0.43 pounds, this is a compact, lightweight fitting suited for residential and light commercial water supply, plumbing distribution, and similar fluid-handling systems. Licensed plumbers and pipefitters install this valve as part of backflow prevention strategies in potable water and general service piping.

This swing check valve is intended for use in 1/2 inch threaded piping systems where backflow prevention is required. Typical applications include residential water supply lines, recirculation systems, pump discharge lines, and general plumbing service where reverse flow protection is needed. The FPT connection type makes it compatible with standard NPT-threaded pipe and fittings found throughout residential and light commercial plumbing installations.

Key Features

• Swing-type disc design opens with forward flow and closes automatically on flow reversal
• 125 PSI pressure class rating for residential and light commercial service
• 1/2 inch FPT (female pipe thread) connections on both ends for standard NPT assembly
• Compact and lightweight at 0.43 pounds for easy inline installation
• Prevents backflow without requiring manual actuation or external controls

Compatibility

Designed as an OEM-style replacement or new-installation swing check valve for 1/2 inch NPT-threaded plumbing systems rated at 125 PSI or below.

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 relieve line pressure completely before removing an existing valve or installing this fitting. Apply thread sealant or PTFE tape to male threads before making up the connection. Verify flow direction matches the valve orientation, as swing check valves are directional and must be installed correctly to function.

Technical Specifications

• Connection Type: FPT (Female Pipe Thread)
• Valve Type: Swing Check
• Size: 1/2 inch
• Pressure Class: 125 PSI
• Weight: 0.43 pounds

Standard Information

• Brand: A.Y. McDonald
• Manufacturer Part Number: 5420-198