Hey guys and gals, new here and I think I have this in the right forum?

We had a spec come through for a job that is asking for "test ports in doors" and now I need to figure out something to spec or design to make that happen and I thought I would come here to see what everyone likes/hates or where I would get something? We had one suggestion to make a port out of PVC fittings but my problem is we are putting it in a unit with 1" OD doors so I am having trouble finding parts that will fit inside.

Ideally I would like a single part, just wondering if anyone out there knew of anything good that works and will seal the hole when not being used for testing.

Thanks.