Radiator Bleed Valve FERRO KZ1 with O-ring 1/2" — radiator air vent fitting

FERRO KZ1 radiator bleed valve with O-ring and 1/2" thread is a compact manual air-vent fitting designed to release trapped air from heating radiators and convectors. The valve’s simple mechanical design provides controlled ventilation of radiator systems to restore even heat distribution and reduce cold spots. Supplied with a sealing O-ring and a standard 1/2" connection, this fitting is intended for replacement or new installation in domestic and light commercial hydronic heating systems.

Advantages

The FERRO KZ1 valve offers reliable manual operation with a tight seal provided by the included O-ring, minimising leakage after bleeding. Its compact form and standard 1/2" thread make it compatible with common radiator connections, allowing straightforward replacement without modifying existing pipework. The valve’s robust construction ensures durability in typical heating system conditions and facilitates easy access for routine maintenance.

Suitable for

• Bleeding radiators and convectors in residential heating systems
• Replacement of worn or leaking manual bleed valves
• Installation in apartments, houses, small offices or light commercial buildings
• Routine maintenance to improve heat transfer and eliminate cold spots

Key specifications

• Connection thread: 1/2" (standard radiator fitting)
• Sealing: O-ring included for leak prevention
• Operation: manual bleed valve
• Application: radiators and convectors in hydronic heating systems
• Material characteristics: metal body with elastomer sealing (O-ring)

How to use

Ensure the heating system is at low pressure or turned off and the radiator is cool enough to touch. Place a small container or cloth beneath the bleed point. Insert the appropriate bleed key or screwdriver into the valve and turn slowly to open the vent until air hisses out, then close when a steady stream of water appears. Check the valve seating for leaks and wipe away any spilled water. After bleeding radiators, verify system pressure and refill or repressurise the heating circuit if necessary.

Usage recommendations

Use the valve only for manual bleeding of radiator systems; avoid excessive force when opening to protect the O-ring seal. Regularly inspect the valve during seasonal maintenance and replace the O-ring if signs of wear or leakage appear to maintain reliable sealing and operation.