Bobbin-wound fiberglass reinforced tank is still the most popular standardin the industry after all. With UV-resistant surface finish, it is able to operate under prolong sunlight for years of reliability. Transparent lid is designed for easy inspection of sand bed. "MS" series(MS450-MS1200) filters are equipped witha six-position, 1.5" & 2.0" & 2.5" multiport valve and ABS laterals.