Plastic Summit valve wrench - $18. These are fairly strong, though with any valve wrench it is very hard to get the first counter clockwise turn on the valve (when removing it) unless the boat is inflated. After you have the first turn, it will be loose enough that you can let the air out of your boat and finish unscrewing it the rest of the way. If your boat is damaged in a way that precludes you from inflating the chamber where you want to remove the valve, you'll have to do your best to try to grab the female valve basket through the boat's material and hold on tight. With AIRE or Tributary boats, if need be you can open a zipper part way and just grip the basket through the bladder material, which usually is easier. We have a $25 minimum shipment so please keep that in mind.