Waterway Clearwater 26" Sand Filter to Pump Union Hose Assembly Round Filter (550 1831) manifolds 0 THP fit and all date code 0 THP fit and all date code compatibility give this impeller practical value because water moving parts work best when they match the intended motor and wet end relationship closely and this Magic Plastics UniBody version features a 1 1 2 inch union by 1 1 2 inch union configuration with a 100 psi rating using the 0501 15 reference This Waterway part is especially practical when the original 26 inch round filter connection needs a correct and complete plumbing renewal this Waterway hose assembly is a practical replacement when the filter to pump union connection line needs restoration