Water filter housing with vent valve 20 inches by 1 inch Brass internal thread inlet/outlet, Resilient to max. 6 bar water pressure This 20" Big Blue® filter is designed for residential as well as commercial and industrial applications. Filter head has built-in pressure release valve. It is compatible with a wide range of 20? sediment, carbon and specialized types of cartridges. Thread size - 1". Only 1x shipping costs, buy your replacement filter cartridges at our affordable prices in our eBay shop right away, click on the following Lettering:Replacement filter Note: Occasionally our manufacturers inform us of delivery delays, so that we have to replace the original product or parts with equivalents from other companies or our own production. The functionality is not affected by this. If.