Hayward Filter Head w/ Clamp System | DEX4820BTC
Hayward Products
SKU: DEX4820BTC
Hayward DEX4820BTC Filter Head with Clamp System (Upper Tank Body) for Pro-Grid DE4820 & SwimClear C4020/C4025/C4030
The Hayward DEX4820BTC is a complete OEM upper filter body (filter head) with clamp system used on select Hayward Pro-Grid vertical grid D.E. filters and SwimClear cartridge filters. It replaces the entire top half assembly when the original head is cracked, warped, leaking at the clamp seam, or no longer seals reliably.
Fits / Compatibility
- Hayward Pro-Grid vertical grid D.E. filter: DE4820 (48 sq ft)
- Hayward SwimClear cartridge filters: C4020, C4025, C4030
What’s Included
- Upper filter body / filter head (top half)
- Heavy-duty clamp ring and tightening hardware
- Metal-reinforced tank seal (O-ring) for the clamp seam (commonly included with this assembly)
Note: Some listings note that certain accessories (such as the manual air relief assembly) may not be included. If your air relief or gauge assembly is damaged, plan to replace it separately.
Common Reasons to Replace
- Cracks or hairline fractures in the filter head
- Persistent leaking at the clamp seam after seal replacement/cleaning
- Warped sealing surface that won’t clamp evenly
- Damaged clamp ring/hardware causing uneven tension
Specs (Quick Reference)
- Part Number: DEX4820BTC
- Part Type: Filter Parts (Filter Head w/ Clamp System)
- Pool Type: In-Ground
- GTIN/UPC: 610377106887
- Replacement Part Warranty: 6 months (parts only)
- Approx. Shipping Weight: 26.4 lb
- Approx. Shipping Dimensions: 16.5" x 22.4" x 24.3"
Installation Notes
- Turn off the pump and fully relieve filter pressure at the air relief before loosening the clamp.
- Clean the tank flange and sealing surfaces thoroughly—grit is a common cause of clamp seam leaks.
- Seat the seal evenly and tighten the clamp uniformly per the filter’s instructions.
- After restart, bleed air until a steady stream of water flows, then inspect the clamp seam for seepage.
Related Products
- Hayward DEX4820BTC (search)
- Hayward Pro-Grid DE4820 Parts (search)
- Hayward SwimClear C4020 Parts (search)
- Hayward SwimClear C4025 Parts (search)
- Hayward SwimClear C4030 Parts (search)
- Metal-Reinforced Filter Tank Seals (search)
- Silicone O-Ring & Gasket Lubricant (search)
Maintenance Tips
- Never loosen the clamp while the filter is under pressure—always shut off the pump and bleed air first.
- Lightly lubricate the tank seal with silicone-based pool lubricant to reduce pinching and improve sealing.
- Keep the clamp band clean and inspect it for cracks or stretching during seasonal service.
- If seam leaks persist after reseating, inspect both tank flanges for warping or damage rather than overtightening the clamp.
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.
Related Products
