The Hayward WG1048AVPAK2 Dual Suction Outlet has an 1-1/2 inch side outlet design and works with vinyl and fiberglass swimming pools. These heavy-duty drains are injection-molded of ABS, which resists chemical attack that leads to “yellowing”. This Hayward main Drain can be used on Residential or Commercial applications; also new construction or replacement covers. Please note that Hayward now offers these only as a 2-pack due to regulations that require pools to have two main drains. Hayward main drains set the standard in quality and value.