CPVC Compression fitting on PEX

[jrh]

I need to cut a pex line into and install a cutoff CPVC valve. Why can't I re connect the pex line by using 3/4 cpvc compression fittings on the 3/4 pex line? They seem to fit tight and would be better in my estimation than shark bites. The rubber seals on the compression give a good fit.
jrh

 

[johnjh2o]

If the connection isn't going to be exposed I would use male and female fittings.

 

[frodo]

you never want to cover up a compression type fitting...they tend to lesk

 

[SHR]

Why can't I re connect the pex line by using 3/4 cpvc compression fittings on the 3/4 pex line?

Because the PEX pipe does not have the rigidity needed to seal a compression fitting. Never use compression fittings on PEX.

 

[steventheplumber]

Because the PEX pipe does not have the rigidity needed to seal a compression fitting. Never use compression fittings on PEX.

you can always use a pipe insert....

 

[steventheplumber]

that should work perfectly...

http://www.canarsee.com/john-guest-tsi28-3-4-cts-pipe-insert