If the crack is in a return pipe you shouldn't normally have to plug a skimmer. If you do you can get a 'gizmo' for the skimmer, nothing more than a plastic hollow tube with the right pipe thread on the bottom. For the return jets there are a couple types of plugs you can buy. An expansion type or a threaded type with an O-ring. The eyeballs have to come out in any case.
Al
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