Here's another vote against dry fitting. Most of the time, when you dry fit PVC, even if you force it, it won't sink into the socket as far as it will once it's wet with glue - this means your dry fit will essentially come up longer than the finished piece, unless you're really careful during assembly to not bottom things out when you glue them (which isn't very good practice).
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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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