Guardair N638 Vacuum Liquid Shut-off Valve 30-55 Gal

Product Description

The GUARDAIR N638 is a liquid shut-off valve assembly designed for industrial and commercial vacuum cleaners. It automatically stops airflow when liquid reaches a critical level inside the tank, protecting the vacuum motor from fluid ingestion. This component is a direct replacement assembly for compatible 30- and 55-gallon vacuum units. Installation is typically performed by maintenance technicians, industrial facility staff, or HVAC and mechanical service professionals who maintain wet-dry vacuum equipment on job sites or in commercial facilities.

The N638 liquid shut-off assembly is intended for use with 30-gallon and 55-gallon capacity vacuum cleaner models. It is suited for industrial job sites, commercial maintenance operations, and facilities where wet-dry vacuums handle liquid collection. This part is commonly replaced during preventive maintenance or after the float mechanism fails to seal properly, allowing the motor to remain protected from liquid damage during operation.

Key Features

• Liquid shut-off assembly prevents motor damage by stopping airflow when liquid level is reached
• Designed for 30-gallon and 55-gallon vacuum cleaner models
• Complete assembly included for straightforward replacement
• Sold individually as a single-unit package

Compatibility

Designed as an OEM-style replacement liquid shut-off assembly for compatible GUARDAIR 30-gallon and 55-gallon vacuum cleaner models.

Installation Notes

Before servicing, power down and unplug the vacuum unit completely. Remove the tank lid or access panel as required to reach the shut-off assembly mounting point. This type of component is typically secured with standard hand tools and should be inspected for proper float movement and sealing after installation. Follow the equipment manufacturer's service documentation for correct reassembly and operational testing.