Filling Valve KK-Pol ZN2 3/8" — KK-Pol HR/ZNPP3/8

Filling valve KK-Pol ZN2 3/8" (model HR/ZNPP3/8) is a compact plumbing component designed to control water supply for heating and domestic systems. The valve features a 3/8" connection compatible with common fittings used for filling, topping up and maintaining pressure in boilers, radiators and other closed-loop installations. Its compact form factor allows installation in confined spaces and on standard service lines where a reliable manual or semi-automatic filling function is required.

Advantages

The valve offers precise control of the filling process and is constructed for corrosion resistance and long service life in typical water heating environments. The 3/8" connection ensures compatibility with many flexible hoses and fitting adapters, simplifying installation. Its compact design reduces space requirements and enables convenient placement near boilers, radiators or manifold systems. Manufacture and materials suit domestic and light-commercial heating applications where straightforward pressure maintenance is necessary.

Suitable for

• Filling and topping up domestic boiler systems
• Maintaining pressure in closed-loop radiator circuits
• Connecting to compatible 3/8" supply hoses and fittings
• Repair or replacement of existing filling valves in heating installations

Key specifications

• Connection size: 3/8" (female/male as applicable to installation)
• Application: water filling and pressure maintenance for heating and domestic systems
• Design: compact inline filling valve suitable for confined spaces
• Material characteristics: corrosion-resistant construction appropriate for potable water and heating circuits

How to use

Shut off the system and isolate the circuit before installing or servicing the valve. Connect the 3/8" fitting to the supply line and secure all joints according to plumbing best practices, ensuring proper sealing. Open the valve slowly to allow water into the heating system until the required pressure is reached, then close the valve. After filling, check for leaks and verify system pressure with the installed gauge. For routine topping up, operate the valve briefly and monitor pressure to avoid overfilling.

Usage recommendations

Use with compatible 3/8" hoses and fittings; confirm material compatibility with your system fluid. Perform installation and maintenance in accordance with local plumbing standards. If unsure about proper installation, consult a qualified heating engineer.