DUO WATER FILTER HOUSING with vent valve 20" x 4.5" inch size with 1 inch Brass internal thread Latest model with double O-ring sealing technology, seals better than 1 O-ring technology! 2 water filter housings 20" from the 'Big Blue' series with sediment and activated carbon block cartridges for applications where a high flow rate is desired. You can also purchase the following replacement filter cartridges with free shipping: 20" 1 µ sediment cartridge, for information and to purchase please click on the following images 20" activated carbon block, please always in conjunction with sediment pre-filter 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 ra.
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