Pentair multiport valve leak

[BLopez0]

I need help diagnosing my issue.

My Pentair Tagelus multiport valve is leaking out of the location circled in the picture.
The o-ring looks fine and I applied pool o-ring grease to it.

I would like any and all advice, info, tips, or solutions.
Thanks!

 

[PoolStored]

O-rings stretch and wear out over time, they can also crack.

I'd order replacement o-rings for the MPV. Lubricate with silicone lubricant like Magic Lube II (not magic lube, or any other lube containing PFTE/Teflon...breaks down the rubber).

 

[BLopez0]

O-rings stretch and wear out over time, they can also crack.

I'd order replacement o-rings for the MPV. Lubricate with silicone lubricant like Magic Lube II (not magic lube, or any other lube containing PFTE/Teflon...breaks down the rubber).

Okay, just bought a new o-ring and silicone lubricant. Installed it and it still leaks….
(Not as bad)

 

[PoolStored]

Did you inspect both sides (top and body) of the MPV? Are either warped? Really odd to leak there, those orings are large diameter, 3/16" Can you measure the diameter of the oring (not outside diamter, diamter of the rubber?

 

[PoolStored]

Also inspect the bevel the o-ring sit in on the body...

 

[BLopez0]

Also inspect the bevel the o-ring sit in on the body...

Alright, I appreciate the help.

I purchased the whole black top multiport valve and all.
I just replaced the top piece and it still leaks.

So now I have to find some time to replace the entire top black multiport valve assembly of the sand filter.
(Unless someone knows another fix or cause)

 

[PoolStored]

If it is still together post a picture of the seam where it is leaking.

Take it apart again and post a picture of the bottom mating surface.

 

[BLopez0]

I ended up replacing the entire MPV.
But if you’re still curious. Here is a picture of the bottom portion.

The zoomed in picture is possibly the cause? Looks like a crack.

 

[PoolStored]

Probably...