Drain Valve ARCO 3/4" G male 20 mm (model 91504230, MPN 504230)

ARCO drain valve with a 3/4" G male threaded connection and a 20 mm nominal diameter is a compact metal valve designed for controlled draining and isolation in plumbing and heating systems. The valve provides a simple threaded drain or bleed point for radiators, boilers, pipes and service lines where a straightforward, durable shut-off or release is required.

Advantages

The valve features a robust metal construction for long service life and resistance to mechanical wear. Its 3/4" G male thread ensures compatibility with common fittings, while the 20 mm nominal diameter delivers sufficient flow for rapid draining and service operations. The compact design allows installation in confined spaces and on standard radiator and boiler outlets without the need for extensive modifications.

Suitable for

• Draining and bleeding radiators and heating circuits
• Emptying boilers and hot-water tanks for maintenance
• Creating service drain points on water supply and pipework
• Temporary isolation and controlled discharge during repairs

Key specifications

• Thread type: 3/4" G male thread
• Nominal diameter: 20 mm
• Material: metal construction suitable for plumbing and heating use
• Function: manual drain/bleed valve for controlled discharge or isolation
• Design: compact form factor for installation in restricted spaces

How to use

Shut down the system and relieve pressure before installation or operation. Thread the valve into the corresponding female fitting or outlet until properly seated and sealed with suitable thread sealant or tape if required. To drain or bleed, open the valve spindle slowly to control the flow; close the valve fully when the desired level or empty state is reached. After use, verify the connection for tightness and restore system pressure gradually according to the system manufacturer's instructions.

Usage recommendations

Install the valve in accessible locations and use compatible fittings to avoid leaks. Regularly inspect for corrosion or wear, especially in systems with aggressive water chemistry, and replace the valve if threads or sealing surfaces degrade. Follow local plumbing codes and safety procedures when performing maintenance or draining pressure systems.