My understanding was that the only real difference between SCH40 and SCH80 was the pipe thickness, not chemical composition.
If there's different glues available, its probably more closely related to it requiring a primer or not, which is more about passing plumbing inspections for potable water vs. non liquid carrying PVC such as electrical conduit which is SCH80, which is the type of SCH80 PVC that home improvement stores typically carry.
The PVC glue in my toolbox says its good for all types of PVC, and it looks like all the common glues that you would get at Home Depot say the same.
SCH80 bulkheads shouldn't affect the flow, only SCH80 pipes have less flow due to the smaller inner diameter. SCH80 bulkheads are just thicker on the outside.
In short, don't worry about it. You can use SCH80 bulkheads with SCH40 Pipes and glue with no issues.
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Last edited by PhysicsDude55; 02-16-2016 at 05:36 AM.