Re: mailing water pumps for rebuilding
The Mercury pumps are physically pretty big and would be a tight squeeze in the USPS Medium Flat Rate carton. There’s no good room for protective padding. At the very least, try the Large flat rate carton and put as much padding around the pumps as possible. If any part of either pump is tight up against the side of the carton, you risk damage from the box being dropped. The Mercury pumps are getting harder to find for cores.
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