Can I use pex from my shower valve to my tub drop ear elbow?
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Yes, you can. But there's an important caveat here. The other connectors are using Sharkbites, which are push connectors. The two in your picture are a compression fitting. You'll either want a crimp ring or a clamp ring to secure the pex to the fitting. These might require a special tool. You might also get away with using a regular screw clamp.