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#1) Yes. Most of them will slide on and stay put without any adhesive needed.
#2) No
#3) I believe is related to #2. It looks to me like the entire valve assembly was roughed in to far forward. The correct fix is to move it back. What kind of access do you have from behind? The quick fix would be to silicone it all, but it will not look good.
#4) Either will work.
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