Review on Silicone Protector Type C Dust Proof Stopper by Travis Oetting

Ideal for sealing open ports. I wanted them to connect open ports to a portable power bank. They don't seal the space with enough friction to keep them from falling out on light impacts. If the holes you need to patch don't move or make contact with anything, this will work. The plugs also have no protruding surfaces for removal. So be careful not to press on them too hard or you'll have to pry them out with tweezers.