Watts 0590722 FV-4M1-1/2 Float-Type Air Vent, 240°F, 150 PSI Max

Description

The Watts 0590722 FV-4M1-1/2 is a float-type automatic air vent engineered for reliable air elimination in hydronic heating and hot water systems. Rated for temperatures up to 240°F and pressures up to 150 PSI, this vent automatically purges trapped air from piping and system components — protecting pumps, boilers, and heat exchangers from air-related efficiency loss and noise.

Designed for professional installation in residential and light commercial hydronic applications, the FV-4M1-1/2 delivers dependable, maintenance-friendly performance. Its float-operated mechanism responds automatically to air accumulation, venting air without manual intervention and helping maintain optimal system efficiency.

Key Features

• Maximum operating temperature: 240°F
• Maximum operating pressure: 150 PSI
• Float-type automatic air venting mechanism
• Suitable for hydronic heating and hot water piping systems
• Helps eliminate air pockets that cause noise, reduced flow, and equipment wear
• Compact design for easy integration into existing piping layouts

Applications

• Hydronic heating systems
• Hot water distribution piping
• Boiler system air elimination
• Residential and light commercial HVAC hydronic loops

Specifications

• Brand: Watts
• Model: FV-4M1-1/2
• SKU: 0590722
• Max Temperature: 240°F
• Max Pressure: 150 PSI
• Type: Float-Type Automatic Air Vent