A.y. Mcdonald 5421-101 Swing Check Valve 1-1/4 in Fpt

Product Description

The A.Y. McDonald 5421-101 is a lead-free swing check valve designed to allow one-directional flow and prevent backflow in plumbing and water distribution systems. Sized at 1-1/4 inches with female pipe thread (FPT) connections on both ends, this valve is rated for a 125 PSI pressure class. The swing-type disc mechanism opens under forward flow and seats automatically when flow stops or reverses. At 1.36 pounds, it is a compact, field-ready component suited for installation by licensed plumbers and pipefitters on potable water and hydronic systems.

This valve is a practical fit for residential and light commercial plumbing applications where backflow prevention is required on water supply lines. The 1-1/4 inch FPT sizing makes it compatible with threaded pipe assemblies common in domestic water service, well systems, and recirculating hot water loops. Its lead-free construction satisfies regulatory requirements for use in systems conveying potable water, including compliance with low-lead content standards applicable in most jurisdictions.

Key Features

• Lead-free construction meets potable water regulations for low-lead compliance
• Swing-type disc provides reliable backflow prevention with low pressure drop
• 1-1/4 inch FPT connections thread directly onto standard pipe fittings
• 125 PSI pressure class rated for typical residential and light commercial service
• Compact form factor at 1.36 pounds for straightforward inline installation

Compatibility

Designed as an OEM-style replacement or new-installation swing check valve for 1-1/4 inch threaded plumbing systems in residential and light commercial potable water and hydronic applications.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the International Plumbing Code (IPC). Shut off the water supply and relieve system pressure completely before removing any existing valve or fitting. Apply thread sealant tape or compound to male threads before making up the FPT connections. Verify the flow direction arrow on the valve body aligns with intended system flow before finalizing installation.

Technical Specifications

• Connection Type: FPT (Female Pipe Thread)
• Size: 1-1/4 inches
• Valve Type: Swing Check
• Pressure Class: 125 psi
• Lead Free: Yes
• Weight: 1.36 pounds

Standard Information

• Brand: A.Y. McDonald
• Manufacturer Part Number: 5421-101