Description
Bell & Gossett 113021 – Model 87 Automatic Air Vent (1/2" x 3/4", 150 PSI)
Overview
The Bell & Gossett Model 87 Automatic Air Vent (Part No. 113021) is a compact, high-efficiency vent designed to remove unwanted air from hydronic (water-based) heating systems. With a dual-threaded connection—1/2" female and 3/4" male—this unit offers flexibility in installation and dependable performance in systems up to 150 PSI and 240°F.
This maintenance-free air vent is ideal for residential and light commercial closed-loop systems, where air accumulation can impact system efficiency or cause noise and circulation issues.
Key Features
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Automatically vents trapped air from hydronic systems
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Brass body with non-ferrous internals for corrosion resistance
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Compact, straight-body design fits tight spaces
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Dual-threaded connection (1/2" FNPT & 3/4" MNPT) for easy installation
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Rated for 240°F and 150 PSI working pressure
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Ideal for boilers, baseboard heating loops, and radiant systems
Specifications
| Attribute | Details |
|---|---|
| Model Number | 87 |
| Part Number | 113021 |
| Product Type | Automatic Air Vent |
| System Type | Hydronic (Water) |
| Body Pattern | Straight |
| Connection Size | 1/2" FNPT (Female), 3/4" MNPT (Male) |
| Thread Type | Male & Female |
| Connection Type | Threaded |
| Material - Body | Brass |
| Internal Components | Non-Ferrous (Stainless, Brass, EPDM) |
| Max Pressure | 150 PSI |
| Max Temperature | 240°F |
| Height | 4-3/4" |
| Width | 2-1/4" |
