Bottle air vents with check valve which allows removal of the vent for cleaning without draining down the system. Approximate height, excluding thread: 82 mm (3.1/4")
https://www.bes.co.uk/automatic-air-bottle-vent-1-2-with-check-valve-7704/29872Automatic Air Bottle Vent 1/2" with Check Valvehttps://www.bes.co.uk/media/catalog/product/a/i/air-vent-1-2in_min_7704_P_1.jpg4.965.52GBPInStock/Heating & Ventilation/Central Heating/Valve/Vent/Plumbing Supplies/Brassware/Bottle Air Vent/Savings/Heating & Ventilation/Renewable/Air Source/Filter & Vent76410473092423312124597627104542284229Bottle air vents with check valve which allows removal of the vent for cleaning without draining down the system.<br>Approximate height, excluding thread: 82 mm (3.1/4")Unbranded00https://www.bes.co.uk/media/catalog/product/a/i/air-vent-1-2in_min_7704_L_1.jpg5056198126324add-to-cartfacet_type:Air Ventspecial_price:5.520000campaign_additional_text3:marchpromo23campaign_category:Plumbingcampaign_now:4.69campaign_was:5.52more_sizes:7703products_related:6918,23523,19886,17842,18638,11346,15583,22757,20924,21905,23475sku:7704marchpromo23Plumbing4.695.52Air Vent77036918,23523,19886,17842,18638,11346,15583,22757,20924,21905,2347577045.5200004.400000No{"Size":"1\/2"","Type":"Air Vent"}Unbranded1/2"