Description
Waterway 550-4200 D.E. Filter Top Manifold Assembly with Air Relief
The Waterway 550-4200 is a replacement top manifold assembly with an integrated air relief for select Waterway Crystal Water D.E. pool filters. The top manifold directs filtered water flow through the grid assembly, while the air relief helps purge trapped air from the filter tank for smoother start-ups and more consistent circulation.
Key Features
- Replacement top manifold for D.E. grid-style filtration systems
- Includes air relief assembly to help release trapped air during priming and operation
- Restores proper internal water routing through the grid pack
- Helps address issues like air accumulation, reduced flow, or poor filtration caused by a cracked/warped manifold
- OEM-style fit for compatible Waterway Crystal Water D.E. filter configurations
Compatibility
- For use with select Waterway Crystal Water D.E. filters
- Match by part number 550-4200 and confirm the manifold style/air relief position against your existing assembly
- Common cross references used in catalogs: 4742-97 and 550-4200B (catalog/packaging references may vary)
When to Replace
- Visible cracks, warping, or broken standpipe/manifold connections
- D.E. returning to the pool after backwash/cleaning (after verifying grids are intact)
- Persistent air in the system or difficulty bleeding air from the filter
- Reduced flow or short filter cycles caused by internal bypass/leaks
Installation Notes
- Turn off power, relieve tank pressure, and drain the filter before opening.
- Inspect the grid pack, standpipe connection, and tank O-ring while the filter is open.
- After reassembly, restart the system and use the air relief to purge air until a steady stream of water flows.
Related Products
- Waterway Crystal Water D.E. Replacement Grids
- D.E. Filter Air Relief Valve / Assemblies
- Filter Tank O-Rings & Seal Kits
- Pool Filter Pressure Gauges
- D.E. Powder (Pool-Grade)
Maintenance Tips
- Bleed air from the filter after servicing and any time the system has been opened.
- Clean the grid pack when pressure rises about 8–10 PSI above your clean baseline.
- Inspect the manifold and grid tops during cleanings—small cracks can cause internal bypass and poor filtration.
- Keep the tank O-ring clean and lightly lubricated to prevent leaks and make future service easier.
