Waterway D.E. Manifold Assembly W/Air Relief | 550-4200
Waterway
SKU: 550-4200
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.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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