The Pentek ST-BC-4 water filter housing holds four 10" x 2.5" double open end cartridges. The Pentek ST-BC-4 stainless steel water filter housing offers a variety of solutions for your large-scale, heavy-duty filtration needs. Simple to install and maintain, this housing is ideal for schools, restaurants, farms, institutions and industrial use. Durable construction The Pentek ST-BC-4 water filter housing is constructed of 304 stainless steel with a gray-silver epoxy finish. Drains on both the “clean” and “dirty” sides of the sump are included.