3/8" BSP Automatic Bottle Air Vent Valve

3/8 inch BSP brass automatic bottle air vent (AAV) / bleed valve with shut off cap that can be used to stop auto venting if so required.

Must be installed in vertical position.

Please note that in certain circumstances air can be drawn into a heating system through an auto valve when the pump is running. If this is the case use the small cap to close off after venting has finished.

** BSP thread sizes are measured a special way - have a look at our information page for more details **