A.y. Mcdonald 747h20 Backup Sump Pump

Product Description

The A.Y. McDonald 747h20 is a water-powered backup sump pump designed to protect basements and crawl spaces from flooding when the primary sump pump fails or loses power. Operated entirely by municipal water pressure, it requires no electricity and no battery, making it a reliable secondary line of defense in residential drainage systems. A licensed plumber typically supplies and installs this unit. The Guardian model designation indicates A.Y. McDonald's backup sump pump product line engineered for dependable automatic activation during primary pump failure events.

The 747h20 is suited for residential applications where a dependable backup is needed during power outages, pump failures, or high-volume water intrusion events that overwhelm the primary pump. It is installed in the same sump pit as the primary pump and activates automatically when water rises to the preset float level. Because it uses city water supply pressure as its power source, it remains fully operational during extended electrical outages.

Key Features

• Water-powered operation requires no electricity or battery maintenance
• Automatic activation via float switch when primary pump is overwhelmed or offline
• Designed for installation alongside an existing primary sump pump in a standard sump pit
• No power outage vulnerability — operates on municipal water pressure

Compatibility

Designed as an OEM-style replacement and new-installation backup sump pump for residential sump pit systems with access to a municipal pressurized water supply line.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and IPC guidelines. Shut off the main water supply before making any connections to the supply line. A backflow preventer or check valve may be required by local code on the supply inlet. Verify that municipal water pressure meets the minimum operating requirements for the unit before commissioning.

Technical Specifications

• Operation Type: Water powered
• Application: Backup sump pump

Standard Information

• Brand: A.Y. McDonald
• Manufacturer Part Number: 747h20