A.y. Mcdonald 3129-458 Pressure Switch 30-50 Psi Well

Product Description

The A.Y. MCDONALD 3129-458 is a lead-free pressure switch rated for 30-50 psi cut-in/cut-out service in residential and light commercial well water systems. It monitors system pressure and signals the well pump to start or stop, maintaining consistent water pressure throughout the distribution system. The 1/4-inch female pipe thread (FPT) inlet connects directly to the pressure tank tee or pump discharge fitting. Licensed plumbers and water system installers are the primary tradespeople who select and install this switch. Its lead-free construction meets current safe drinking water standards, making it suitable for potable water applications.

This pressure switch is intended for use in submersible and jet pump well systems where a 30-50 psi operating range is required. The 30 psi cut-in and 50 psi cut-out settings are among the most common configurations in residential well installations, making this a frequent replacement and new-installation part. It mounts to a standard pressure tank tee assembly and connects to the pump control circuit to automate pump cycling.

Key Features

• 30-50 psi operating range suits standard residential well pressure requirements
• Lead-free construction complies with safe drinking water regulations for potable water systems
• 1/4-inch FPT inlet fits standard pressure tank tee and pump discharge fittings
• Designed for reliable pump start/stop control in well water applications

Compatibility

Designed as an OEM-style replacement pressure switch for residential and light commercial well pump systems requiring a 30-50 psi cut-in/cut-out range with a 1/4-inch FPT connection.

Installation Notes

Installation should be performed by a licensed plumber or pump system technician. Shut off power to the pump and relieve system pressure before removing or installing any pressure switch. The switch connects into the electrical circuit controlling the pump motor, so all wiring work must comply with applicable NEC requirements and local codes. Verify that the FPT connection is sealed with an approved thread sealant rated for potable water service.

Technical Specifications

• Pressure Range: 30-50 psi
• Connection Type: 1/4 inch FPT
• Lead Free: Yes
• Application: Well water pump systems

Standard Information

• Brand: A.Y. MCDONALD
• Manufacturer Part Number: 3129-458