Manufacturer: Lifegard Aquatics. Manufacturer ‏ : ‎ Lifegard Aquatics. Item model number ‏ : ‎ 1/2″ Elbow Insert. Item model number: 1/2″ Elbow Insert. Material: Acrylic. Item Weight: 1.6 ounces. #1,539 in Aquarium Filter Accessories.