I've got a project where we're going to use split-bolts (Kearny's) to make some joints up and I don't want to tape them up (area is indoor & dry). Who makes those insulated plastic "clamshell" covers for that purpose? Or what is another trade name for them? I couldn't find it on Tradeslang.com

It's been awhile since I've needed these and I can't
remember the manufactuer or what they were called.

Thanks