Hoffman 79 Water Main Vent Valve | 401488 — UnitedBuilt Equipment Skip to content
Quality Water Truck Systems, Tanks & Parts Since 1947
Quality Water Truck Systems, Tanks & Parts Since 1947
Straight Water Vent Valve, Hoffman 79, 1/2" x 3/4" 401488 - UnitedBuilt Equipment

Hoffman Specialty 79 Water Main Vent Valve, 401488

SKU 0004112
Brand Hoffman
Availability:
3 in stock | Available on backorder
$0.00 - $0.00
$0.00
$264.00
$264.00 - $264.00
$264.00

Product Images

Images are for representation only and may differ from the actual product.

Questions about this product?

Hoffman Specialty Model 79 water main vent valve, part 401488, releases air from compatible hot-water, cold-water and glycol-water mains. The straight inlet provides both 1/2-inch female NPT and 3/4-inch male NPT connection options.

A built-in check valve helps prevent air from entering when system pressure falls. The removable top supports service access, and the 1/8-inch NPT outlet allows a safety drain connection where discharged moisture needs to be directed away.

Vent air without inviting it back

Feature Benefit
Built-in check valve Helps prevent outside air from returning as system pressure drops.
Dual-size inlet Offers either 1/2-inch female or 3/4-inch male NPT connection.
Removable top Provides access for vent maintenance.
Threaded discharge Accepts a piped drain for managing moisture discharge.

Technical specifications

Specification Detail
Manufacturer / model Hoffman Specialty 79
Manufacturer part number 401488
Inlet 1/2-inch female NPT /3/4-inch male NPT, straight shank
Outlet 1/8-inch NPT safety drain connection
Maximum operating pressure 75 psig (maximum pressure against which the vent can open)
Maximum hydrostatic pressure 200 psig; not the operating venting-pressure rating
Maximum temperature 250°F
Fluid selection Hot or cold water, or glycol-water applications with specific gravity greater than 0.7

Before ordering

Select this vent by the actual system pressure and fluid, not connection size alone. The 200 psig hydrostatic limit does not increase the 75 psig operating limit.

Check What to confirm
Replacement identity Match Model 79 and part 401488; do not substitute the different Model 78 on size alone.
Connection arrangement Identify which inlet thread your system uses and whether a drain line is required.
Service conditions Confirm pressure, maximum temperature and fluid specific gravity.
Installation and maintenance Follow the manufacturer instructions and provide access to the removable top. Verify the suitability of the vent location and drainage arrangement.

Need help selecting the correct water main vent? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your existing part number, connection size and operating pressure.