Pentair R171060 330 Linear Polyethylene Floating Chemical Dispenser with Screen 330 Floating chemical dispenser For use with bromine or slow dissolving trichlor tablets Linear polyethylene construction and foam filled for added buoyancy Includes screen which is installed between adjustment ring and body and it has twist lock cap, adjustable control ring Measures 14-3/4-inch length by 22-inch height by 19-3/4-inch width