Cut a piece of old Aquaclear filter sponge about 1.25-1.5" by 3-4". Cut a finger slot in the 1.25-1.5" to make a sponge finger puppet. Slip it over the end of the AC 500 intake tube. If it doesn't fit right, the finger puppet hole isn't deep enough.
OT: I love me some WEC!!! It's on Versus right now, so I had to mention it.
Pictures of the sponge finger puppet:

OT: I love me some WEC!!! It's on Versus right now, so I had to mention it.
Pictures of the sponge finger puppet:
