"Plumbing silicone" is a lubricant (grease), not an adhesive. It won't stick things together.
It will, however, totally interfere with the PVC cement you use to glue the plumbing together, so I would not advise using it to dry fit components unless you carefully clean every trace of it from the plumbing afterwards.
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Inconveniencing marine life since 1992
"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
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