Low point drain valves replacement

[beaubeau]

Hi. All 3 of these valves are leaking.

https://ibb.co/9tky4wT

I cut 1 out and bought a SharkBite PEX valve.
Apparently the lines look like (to me) PEX, but it’s not quite PEX.
The PEX rings just wad up the line, like this:

https://ibb.co/hYd0GgF


Any ideas?

Thanks a lot.

[johntank]

I don't know what size tubing you have, but it looks looks like you used a 3/8" fitting when you need a 1/2" fitting.

[enblethen]

I use this type PEX crimps
Inexpensive tool! Use same style on my sprinkler system.
Push to fit fittings are also good. Sharkbite is one brand but little higher in price.

[beaubeau]

I think you’re right! I think I used the 3/8 die for 1/2” line, thank you!!

[MountainAir05]

Second photo the ring was not put on with the correct tool

[enblethen]

Second photo shows a compression ring quite possible the wrong size.