Hayward Clamp Nut & Bolt | DEX2421J2
Hayward Products
SKU: DEX2421J2
Hayward DEX2421J2 Clamp Nut & Bolt Kit (Replacement Hardware for Filter Clamp Ring)
The Hayward DEX2421J2 is an OEM clamp nut and bolt kit used to tighten and secure the clamp band that holds the upper and lower tank halves together on compatible Hayward filters. If your clamp hardware is rusted, stripped, missing, or won’t tighten smoothly, replacing this nut/bolt set helps restore a secure, leak-resistant clamp connection.
Fits / Compatibility
- Hayward SwimClear cartridge filters (commonly listed across multiple SwimClear models depending on revision)
- Hayward Pro-Grid vertical grid D.E. filters: DE2420, DE3620, DE4820, DE6020, DE7220
- Also commonly referenced for certain Hayward clamp systems used on select sand filter configurations (verify by parts diagram)
What It Does
- Provides the tightening bolt and nut used to tension the filter’s clamp ring
- Helps maintain even clamp pressure so the tank seal can seat properly
- Restores clamp function after corrosion, thread damage, or missing hardware
What’s Included
- (1) Clamp bolt
- (1) Clamp nut
Note: This kit is the bolt and nut only. If you need the full clamp system (clamp ring + seal + hardware), look for the complete clamp kit for your filter model.
Installation Notes
- Turn off the pump and fully relieve filter pressure at the air relief before loosening/tightening the clamp.
- Clean the clamp band and tank flange area—grit can cause uneven clamping and leaks.
- Tighten smoothly and evenly per the filter manufacturer’s instructions (do not overtighten).
- If the seam still seeps, inspect/replace the tank seal and check for flange damage or warping.
Related Products
- Hayward DEX2421J2 Clamp Nut & Bolt (search)
- Hayward DEX2421JKIT Complete Clamp System Kit (search)
- Hayward Metal-Reinforced Tank Seal (search)
- Hayward Pro-Grid DE4820 Parts (search)
- Hayward SwimClear C4030 Parts (search)
- Silicone O-Ring & Gasket Lubricant (search)
Maintenance Tips
- Never work on a filter clamp while the system is pressurized—always shut the pump off and bleed air first.
- Inspect clamp hardware each time you open the filter; replace any stretched, corroded, or damaged fasteners early.
- Keep the tank seal clean and lightly lubricated with silicone-based lube to improve resealing and reduce pinching.
- If you repeatedly need to overtighten to stop seepage, replace the tank seal and inspect flange surfaces instead of forcing 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.
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