Replace bathroom sink supply lines of rigid Grey plastic

[TinkeringTyrion]

Supply lines for the bathroom sink are made of a gray rigid plastic and there's no way to unscrew anything it's all like glued and crimped or something I can't figure it out also the valves are made of plastic entirely. When I try to look up DIY guides for this they all reference or show easily unscrewed, flexible supply lines. I don't see any reference to a rigid plastic system which uses epoxy instead of threading. The reason I want to replace it is that the new faucet won't fit the brass top screw ons on the ends of the pvc line or whatever the hell it is.

 

[TinkeringTyrion]

Can

How about a photo ?

 

[Sponsor]

 

[MKS]

It maybe polybutylene.
Apears to be not in use now.
Looks like there are many push on type fittings available.

PEX to Poly adapter.

 

[FullySprinklered]

It's poly. You'll have to convert it to something you can work with, either above or below the shutoff. If the shutoffs still work, you could convert to pex using a sharkbite coupling which accepts poly on one side and pex on the other. Then attach a push stop to the pex nub. Use a regular lavatory supply tube up to the faucet.

 

[TinkeringTyrion]

Thank you very much I followed everything except for "use a push stop to the PEX nub" are you saying that the pex that fits to the coupler should be a short length of line which then gets fitted to a new steel flex supply line? is this push stop threaded? if so I think I get it, if not, then how do I end up with something to screw the new flex line onto? or is the pex going to reach all the way up to the faucet? thanks

 

[FullySprinklered]

Thank you very much I followed everything except for "use a push stop to the PEX nub" are you saying that the pex that fits to the coupler should be a short length of line which then gets fitted to a new steel flex supply line? is this push stop threaded? if so I think I get it, if not, then how do I end up with something to screw the new flex line onto? or is the PEX going to reach all the way up to the faucet? thanks

The push-on stop will push on to the PEX nub and the stop will have 3/8 compression threads on the outlet side which the supply tube will attach to.