Part # 4655-03D
Manufacturer Code 25357-982-00
Aftermarket Air Relief Manual Valve Assembly — CMP Replacement for Pentair® (98209800)
Aftermarket air relief manual valve assembly by CMP. Direct-fit replacement for the Pentair® Relief Manual Valve Assembly used on select Pentair, American Products, and Pac Fab filters.
➜ Need help matching your filter? Text/Chat with a Tech
➜ Ordering for a service route? Request a Quote
Why this assembly?
✅ Restores safe, fast air purging to protect tanks and improve filtration startup.
✅ Drop-in replacement for common Pentair® filter lids—no guesswork.
✅ Complete kit includes valve, gauge, fittings, labels, and tape to finish the job in one trip.
Compatibility (read before you buy)
✅ Fits many Pentair®/American Products/Pac Fab filters, including:
• Sandpiper
• Clean & Clear and Clean & Clear Plus
• Predator
• FNS Plus (DE)
➜ OEM cross-reference: Pentair® 98209800 (assembly)
➜ Gauge in kit: 25357982000 (pressure gauge)
⚠️ Always verify your filter model and lid style before ordering. If your unit uses an automatic relief or a different lid boss/thread, this kit may not fit.
What’s included (kit contents)
(1) ✅ High-flow manual air relief valve
(1) ✅ Rubber boot
(1) ✅ Nipple, 1/4" NPT x 7/8" L
(1) ✅ Plug, 1/4" NPT
(1) ✅ O-ring
(1) ✅ Warning label for clamp
(1) ✅ Warning label for safety reminders
(1) ✅ Teflon tape
(1) ✅ Pressure gauge (25357982000)
Key features
✅ High-flow venting for quicker, safer air release
✅ 1/4" NPT connections (standard on many filter lids)
✅ Replacement labels to maintain on-tank safety compliance
✅ Aftermarket build engineered by CMP for Pentair® replacements
Install notes
➜ Shut off pump and bleed pressure fully before service.
➜ Remove old assembly, clean threads, apply Teflon tape (included), and install fittings hand-tight plus a quarter-turn.
➜ Position warning labels per instructions to keep safety notices visible.
➜ Start system and check for leaks; re-tighten as needed.
⚠️ Do not open or remove the air relief while the system is pressurized.
⚠️ Replace damaged lids, clamps, or O-rings before returning to service.
Warranty & returns
✅ 6-month parts-only warranty on replacement parts.
➜ Hassle-free returns—start from your account; see policy for timeframes.
FAQs
Is this an OEM Pentair® part?
➜ No. This is a CMP aftermarket assembly designed as a direct replacement for Pentair® 98209800.
Will it fit my filter?
➜ Often, yes—Sandpiper, Clean & Clear/Plus, Predator, FNS Plus are typical fits. Check your lid boss and threads to confirm.
My gauge failed—can I reuse my old one?
➜ You can, but a new 25357982000-style gauge is included to ensure accurate pressure readings.
Click to view Pentair Air Relief Assembly for Pool Filters, Includes Pressure Gauge - 98209800
Can I install this myself?
Reply
The Air Relief Assembly can be installed by a homeowner. It requires that you unthread the old one, wrap some teflon tape around the threads of the new valve, and thread it back into place.
Reply
Will this valve assembly work on an Aquatec FN/FNS-48 filter?
Reply
My relief valve is dripping. I have a Purex-Triton Filter model #CC100..
Design flow=100 g.p.m. and 6.5 psi residential. There is a pin number on the tank housing =178555..Do I need to purchase the entire relief valve OR the very small "O" rings inside the valve? I have had this unit since 2000. I do not know if this assembly 998209800 is the correct fit But it sure looks like it! Thanks
Reply
Hi Charlie, This would be the correct air relief for the Purex-Triton Clean & Clear CC100 filter. For the CC100 filter I do not show where the small o-ring is sold separately so I would suggest the entire air relief.
Reply
Less than 1 hr
None
Less than 1 hr
None
1 0
Less than 1 hr
Adjustable Wrench
3 0
This was a very easy replacement, and the cheapest replacement I found! We just turned off the breakers, released the air from the air relief valve. We were replacing filter cartridges too, so we took the top off the filter. Unscrewed and removed the old air relief valve, and replaced it with the new one on. We then put some Teflon tape on the screw head of the air pressure gauge, screwed it on hand tight, then used a wrench to tighten it...voila! No more leaks and working very well!
Less than 1 hr
Adjustable Wrench, Teflon Tape
1 0
Very simple. All one needs is teflon tape and an adjustable wrench. Functions well. Pay particular attention to the orientation of both the gauge (readable location) and the outlet (it will fire water all over that direction) as it is tightened.
Less than 1 hr
Adjustable Wrench, Pipe Tape
1 0
I turned the pump off
Released the pressure
Took old assembly off using wrench
Pipe taped the pressure gauge, and assembled it with the relief valve
Pipe taped the nipple and assembled it with my filter
The Most Helpful Review
5 0
(3 out of 5 stars) Replacement for Pentair Pool Filter Relief Valve
Reviewed By: DynaWg from Pleasanton, CA ()
Pros: Quick and easy to install
Cons: Leaks if closed tightly
This is a repalcement the original valve (<4 yrs. old)that eventually began leaking do to a crack at the base where the gauge was threaded. This product was easy to replace, reasonably priced and arrived in a timely manner from INYO. The only problem with this particular valve is that if twisted closed too tightly leaked. I found that you don't need to twist it closed too tightly. Just twist until until it stops (you may need to back off just a little) to ensure it is closed all the way. We will see how long this part lasts.
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The Most Recent Reviews
(5 out of 5 stars) perfect replacement
Reviewed By: Inyo Customer ()
I broke off old one accidentally, this was replaced in about 2 minutes
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1 0
(5 out of 5 stars) Excellent Spare Part
Reviewed By: Inyo Customer ()
Installed easily, functions well, good install and operation documentation.
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1 0
(5 out of 5 stars) Easy Install
Reviewed By: Inyo Customer ()
Works perfectly. Had ordered one previously from a different place and it didn't fit. This one was easy to install and fits perfect.
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1 0
(5 out of 5 stars) Replacement parts
Reviewed By: Inyo Customer ()
Replacement parts for Pentair Filter
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1 0
(5 out of 5 stars)
Reviewed By: Don K. from Irving, Tx. ()
Mainly got this product to be able to read the gauge easier. Works very well , easier to see from a distance ...
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1 0
(5 out of 5 stars) Air Relief Manual Valve Assembly (98209800)
Reviewed By: Willian F R. from Woodbridge VA ()
Pros: Great value
Cons: None
Great experience: rapid delivery, reasonable price, great instructions and easy to install.
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1 0
(5 out of 5 stars) Upgrade to my old Relief Valve and Pressure Gauge
Reviewed By: Adam O. from Houston, TX ()
Pros: Easy to install, clear reading on the pressure gauge
The old equipment that I inherited was, well, old and useless. I needed an upgrade and these parts have exceeded my expectations.
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