Watts 0590721 FV-4M1-1 Float-Type Air Vent, 240°F Max, 150 PSI Max

Description

The Watts FV-4M1-1 (SKU 0590721) is a float-type automatic air vent engineered for reliable air elimination in hydronic heating and hot water systems. By continuously purging trapped air from piping and system components, it helps maintain peak system efficiency, prevents airlock, and protects circulating pumps and heat exchangers from damage caused by air pockets.

Key Features

• Automatic float-type design continuously vents air without manual intervention
• Maximum operating temperature: 240°F — suitable for high-temperature hydronic applications
• Maximum operating pressure: 150 PSI — built for demanding system pressures
• Compact, durable construction for long service life in hydronic and steam-adjacent systems
• Helps prevent airlock, noise, and reduced heat transfer caused by trapped air
• Easy installation into standard hydronic piping configurations

Typical Applications

• Hydronic heating systems and hot water boiler loops
• Radiant floor heating distribution systems
• Fan coil and baseboard heating circuits
• Any closed-loop piping system requiring automatic air elimination

Specifications

• Brand: Watts
• Model: FV-4M1-1
• SKU: 0590721
• Maximum Temperature: 240°F
• Maximum Pressure: 150 PSI
• Type: Float-Type Automatic Air Vent

Trust Watts quality and the expertise of Jackson Systems to keep your hydronic system running quietly and efficiently. Order the Watts FV-4M1-1 Air Vent today.