I just took off the foam gasket from the old battery pack and glued it on the new one. So far it seems OK but I have only used the PB a couple of times since I changed out the battery. I don't think that the foam gasket that is on the battery pack even serves a purpose. The waterproof part is the motor/battery cover.
No guarantee from Interstate, I didn't even tell them that this was for an underwater application.
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