Waterman 4800001 Air Vacuum Relief Valve 1.5 in

Product Description

The WATERMAN 4800001 is an air and vacuum relief valve designed to protect piping systems from negative pressure conditions and air pockets that can cause water hammer, flow restriction, or pipe damage. Sized at 1.5 inches, this valve automatically releases trapped air during system startup and admits air to prevent vacuum formation during draining or sudden pressure drops. It is suited for water distribution, irrigation, and plumbing applications where pressure management is critical. Licensed plumbers and irrigation technicians are the primary installers of this type of valve.

This air and vacuum relief valve is intended for use in residential and light commercial water distribution lines, irrigation mainlines, and similar piped systems where trapped air or vacuum events are a service concern. The 1.5-inch port size accommodates moderate-flow piping runs. Install at high points in the pipeline where air naturally accumulates or vacuum is most likely to develop.

Key Features

• 1.5-inch connection size suitable for moderate-flow water lines
• Automatic air release and vacuum relief in a single valve body
• Protects piping from water hammer and negative pressure damage
• Compatible with standard threaded pipe fittings at 1.5 inches
• Designed for straightforward inline installation at pipeline high points

Compatibility

Designed as an OEM-style replacement or new-installation air and vacuum relief valve for 1.5-inch water distribution, irrigation mainline, and plumbing piping systems.

Installation Notes

Installation should be performed by a licensed plumber or qualified irrigation technician in accordance with applicable local plumbing codes and the IPC. Shut off system pressure and depressurize the line fully before removing an existing valve or making new connections. Mount the valve at the highest accessible point of the pipeline to ensure proper air and vacuum relief function. Do not install below grade or in an orientation that restricts the valve float mechanism.

Technical Specifications

• Connection Size: 1.5 inches
• Valve Type: Air and Vacuum Relief
• Order Increment: 1

Standard Information

• Brand: WATERMAN
• Manufacturer Part Number: 4800001