Cannot remove multiport from white piping on Pentair Tagelus TA60D

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I inherited a sand filter and when i went into replace the sand the whole lateral assembly came up and i cannot detach the multiport from the white pipe

previous installed must not have lubed it

can i remove or detach or fold the laterals and take it out ?

can i tap the multiport off the while stand pipe ? afraid to chip/crack it ?

WD40 ?

please help.

I'm completely suck

here the manual : https://waterlinetechnologies.com/c...elus_Owners_Manual_English_French_Spanish.pdf

 

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I've figured it out :

1. Added a bit of WD 40 to the gap from bottom and through the multiport valve(after disassembling it)
2. I let it stay overnight to soak up the WD40
3. Then with my Chanell locks i lightly held the white PVC pipe and twisted the multiport off. It began to move a little
4. Then rocked the white pipe back and forth with Chanell locks until it came apart.
5. It finally came came out and there is a lot of sand in the join which helped bond it together. (figures)

Point to note : Always lube the join before you put it back - wow that took me 3 hrs. and over 2 days to figure that out. WOW