Pump Threaded Fitting Dripping

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huggablejunk

Bronze Supporter
Nov 14, 2017
33
Marietta, GA
Hi Guys,

Recently noticed that my threaded fitting coming out of my Whisperflo is starting to drip. We've had a few hard freezes recently in Georgia and I'm just wondering if something cracked in there. It doesn't drip every single time the pump runs but it's regular enough for me to notice. I've never taken this fitting off so I'm not really sure what I'd be getting into if I repair this myself. Any recommendations on the best ways to repair this? (Open it and apply thread sealant? Which one? etc). Is there an o-ring in there? Just didn't want to try to open this up without having the repair stuff on hand.

Thanks for any advice,
Ron
 

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You can use some Teflon tape and sealant if you want to make a more secure connection.

If you use Teflon Tape, don't get it too thick and don't let it interfere with the O-ring.
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This makes total sense - I replaced a bunch of the o-rings (pump, filter, valves) this year on a now 9.5 year old system and I didn't realize these unions had o-rings in them too. Go figure the once I didn't replace starts leaking.

Hate to be a pain, but any idea if those o-rings are purchasable online? (I was looking around and it didn't seem like they were solve separately). I found the whole union fitting like you showed and I'll probably just buy two of those to make sure I get the o-rings if I can't get the o-rings themselves.
 
Looks like maybe Praher E331 2" PVC Union O-Ring.

Just find size 331.
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www.wildwestpoolsupplies.com

Praher O-Ring For 2 Inch PVC Union | E331

Buy Praher O-Ring For 2 Inch PVC Union | E331 for sale here at Wild West. Get yours today! Save on tons of great pool supplies & receive top-notch service.
www.wildwestpoolsupplies.com www.wildwestpoolsupplies.com

E-331 | O-Ring For 2 Inch PVC Union

O-Ring For 2 Inch PVC Union
www.getpoolparts.com www.getpoolparts.com

O- Ring for 2" Praher Single Union Ball Valve - N-331 - INYOPools.com

O- Ring for 2" Praher Single Union Ball Valve - N-331 - Pool & Spa Parts
www.inyopools.com www.inyopools.com

Parco O-ring 2-1/4" ID, 3/16" - 331 - INYOPools.com

331 - O-RING (331)
www.inyopools.com www.inyopools.com
 

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www.sealanddesign.com

O-Ring Sizes

There are two main o-ring sizing types. Standard was developed for use in the USA, while the international community uses metric for their o-ring dimensions.
www.sealanddesign.com www.sealanddesign.com

www.sealanddesign.com

O-Ring Sizes

There are two main o-ring sizing types. Standard was developed for use in the USA, while the international community uses metric for their o-ring dimensions.
www.sealanddesign.com www.sealanddesign.com
 
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@JamesW This fixed it perfectly! I ordered two of the o-rings as they were on top and bottom. The old ones were definitely flatter and starting to deteriorate when touched. Had to uncouple the inlet too to move the pump as you suggested. Overall 15 minute job moving slowly. Applied some magic lube to the seals and put the unions back on hand tight (my biggest fear was breaking the union nut.

Thanks a ton!
 
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I see what you're saying, but on my union the E331's fit perfectly on both sides. The tolerances/difference on them must be tiny. Been watching the pump for a while now with no leaks. I have the two original ones I pulled out and honestly one looks like it could be ever so slightly larger, but the fact they fit into track for #4 I think it's not a problem.
 
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@JamesW had to make sure I wasn’t nuts as the o-rings I took out looked identical in size. Found the catalog you referenced and looks like parts #4 and #12 are E331 o-rings for my 200-906 2”.

@PoolStored interesting on magic lube vs magic lube 2. There are literally thousands of positive reviews on Amazon for Magic Lube and I’ve had no issues to date. Is it something with pool o-rings that we need silicon vs Teflon?
 

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huggablejunk said:
@PoolStored interesting on magic lube vs magic lube 2. There are literally thousands of positive reviews on Amazon for Magic Lube and I’ve had no issues to date. Is it something with pool o-rings that we need silicon vs Teflon?
Click to expand...

Pool Lube - Further Reading

www.troublefreepool.com www.troublefreepool.com

As most O-rings and seals are made of synthetic elastomeric polymers, i.e., "rubber" material such as nitrile, EPDM, and Neoprene, they are the best lubricants for them derived from synthetic compounds. At the top of the list are silicone-based and ester-based lubricants. In comparison to other types of lubricants, synthetic-based lubricants perform better over a wide range of conditions. They offer an excellent reduction in friction, are waterproof, and have low volatility, high-temperature stability, and low-temperature fluidity. Where ester-based lubricants are biodegradable, both are safe, and neither pose health risks or contamination by contact when you use your hands or fingers for application. These lubricants can be used on natural rubber products as well.

www.manuf-rubber.com

What Is the Best Lubricant for O-Rings? | Manufacturer's Rubber

What is the best lubricant for o-rings? It depends on the application, but choosing correctly will ensure a long service life for the part.
www.manuf-rubber.com www.manuf-rubber.com
 
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