Waterway Coupling Kit Assy [w/Filter Std Base] is a Waterway plumbing fitting used to connect, adapt, or repair compatible pool, spa, and bath plumbing lines. Its sizing and configuration are designed to help match specific Waterway equipment layouts and service requirements.It is well suited for equipment pad repairs, plumbing transitions, and replacement work where the original fitting style and part number matter. Before ordering, compare the part number, connection size, shape, and system compatibility with the component being replaced. Genuine-style replacement part for compatible Waterway systems Helps restore proper fit, flow, sealing, or service function Useful for pool, spa, bath, and equipment repair applications Part number 419-7251 helps confirm the correct replacement Recommended for matching by model, dimensions, and existing part design