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I have a shower which has a join between glass and marble which has recently started leaking. As a first step, I've removed the grout for replacement, but it looks like there's some sort of rubber seal underneath, which I believe I need to replace as well as it's located where the leak is coming from. What is this part called, and is it part of the waterproofing mechanism? Is this the only thing I'm likely to need to replace in addition to putting new grout and sealer on?

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    Please annotate your photo to point to where the "grout" you removed came from and what the "rubber seal" is. It's hard to tell for sure, but grout is usually installed between tiles to fill the gap, and the join between the glass and marble would likely be silicone caulk, though there could have been a rubber seal in the factory glass shower kit.
    – FreeMan
    Apr 11, 2022 at 0:20
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    A second, wider angle picture would help us better understand the situation which is, currently, only obvious to you.
    – FreeMan
    Apr 11, 2022 at 12:40

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It appears to be a silicone/butyl rubber seal, that will prevent moisture intrusion and also allow for the expansion and contraction of the two different materials at that joint. Each material has different expansion and contraction qualities and that silicone/butyl rubber seal is providing the space needed to allow those materials to do what is necessary. So it is in place for more than one purpose.

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