Item 1634 Your Price today: $ 13.57 Currently out of stock. Call or e-mail for availability info, or else click here for a form to tell us how many you wanted to order. Undergravel Filter plates for tanks measuring 12 x 48 inches. 1 inch uplift tubes. Can be used as is with air operation or with powerheads (air pumps and powerheads sold separately). For fresh and saltwater.