* FBB2010, 20” Long BIG BLUE filter cartridge casing housing assembly for WH-20, WH-25, WH-250 * BLUE COLOR * Single O ring design * High quality filter housing NSF approved housing for drinking water * No BPA * Top and Bottom included. * 1" NPT in/outlet * Fittings, bracket, wrench not included. * Fits 4.5 x 20” filter. * Temperature rang: 40-100 degree Fahrenheit. * Pressure range: 30-90 PSI * If pressure will at any time exceed maximum rating of 90 PSI, a PRESSURE REGULATOR MUST BE INSTALLED before the filter housing.