The Hobie Thru Hull Plug is a replacement plug that allows you to thread wires through the hull of your boat to install fishfinders, GPS and more. One plug, nut, and o-ring is included.
Good product. Be sure and install on a flat surface, and if you install on a Twist and Seal hatch, be certain you drill in the absolute center of one of the reinforcing squares on the bottom side of the hatch; otherwise you cannot install the nut and o-ring. I messed mine up and had to reverse it and had to slather the goop on to seal it. Not the product's fault.
Woks great and give a nice finished job.