You will need :
C7 Valve Wrench
Hypalon Patching Material
Two Part Adhesive
Before you begin, keep in mind that the inflatable tube opening required for both of the A7 and the C7 valves are very similar. The first thing to do is make a 3 inch incision in the pontoon near the floor of the boat and in line with the A7 Valve. Holding the exterior portion of the valve (valve cap side), reach into the tube through the incision and grab the inner base of the A7 Valve. While holding the exterior portion of the valve, unscrew the inner base of the A7 valve by turning it counter clock wise. Remove and discard both portions of the A7 valve.
Unscrew the base of the C7 valve. Take the base of the C7 in one hand, reach into the through the incision and line the base of the C7 valve up with the hole from the removed A7/B7 valve, using your free hand, screw the exterior portion of the C7 valve into the C7 Base. Tight firmly using the C7 valve wrench.
Patch the incision with fabric and a two part adhesive per the adhesive manufacturer’s instructions.