Rewire, I know of the rejectors you are talking about, but those are different. I haven't seen those in years.
The ones I'm talking about take the type S fuses that Iwire has linked to. This is the only picture I could find of the adaptor: http://www.hvactool.com/product_images/MA-16SA.gif
The little wire sticking out the side of the threads make it tamper resistant.
My reason for this post is lately we've been installing a lot of these rejectors (adaptors) and type S fuses to satisfy the insurance companies requirements. I couldn't figure out why they even made one for 30 amps, but e57 answered my question (duh...I never even thought of that!)....thanks.