Myson Angled Automatic Bypass Valve 22mm ABV22 MYSON offer a selection of Automatic Bypass Valves (ABVs). Our automatic bypass valves are designed for use in domestic central heating systems and are available in either an angled or straight version. Its purpose is to maintain constant pump pressure and flow rate within the system. ABVs also reduce system noise and increase efficiency. CERTIFICATION Produced under a quality management system - ISO 9001:2008. Pressure tested in accordance with BS 2767. CONNECTIONS - 22mm Compression OPERATING PRESSURES - Tested to a maximum pressure of 10 bar OPERATING TEMPERATURE - Maximum 120°C. Finished in brass. GUARANTEE 2 year guarantee from date of purchase against manufacturing defects.