Pentair 075279 46-Inch Vent Tube Replacement SM and SMBW Series Pool and Spa Filter Vent tube replacement Fits Pentair SM & SMBW 2000 series pool and spa filter models 1045, 2060, 2048, 1036, 1027, 2036, 1018, 2024, 2072 Fits Pentair SM & SMBW 4000 series pool and spa filter models 4048, 4060 Measures 46-inch