Laguna UV-C Head O-Ring for Pressure-Flo Pressurized Filters Reversible argyle raincoat Fits Laguna Pressure-Flo pressurized filter models 700, 1400, 2100, 3200 Comes in polybag with Laguna header Measures 2/7-inch length by 3-1/5-inch width by 5-4/5-inch height