This is a great product and absolutely necessary to keep water out of your radio box, and even the hull. We designed this simple and effective seal kit to work better than anything else on the market. All you do is drill a hole through your radio box and screw the seal mount in place. Next install the boot over your push rod followed by an O-ring to secure the boot in place. This design enables you to put the boot in or on the outside of your radio box what is best for your room limitations. The mount is also designed to be able to be used for transom exit for hulls up to 3/8" thick.