The Aqua "BIG ONE" is a unique polypropylene housing for professional applications where high performances and reliable products are needed. Designed to treat high quantities of water, its a 2 piece compact filter housing, that can fit 23" and 40" filtering elements. The housing is made with 3" BSP Thread female in-outlets (or upon request DN80 Flanged, and is equipped with plastic drain plug and plastic relief valve. The housing is provided with a stainless steel clamp that enables you to easily open and close the housing during maintenance operations.