Groco Thru-Hull Install Tool

• Slide the thru-hull fitting, flanged end first, over the tool. (It will stop at the proper step.)
• Tie a length of monofilament to the eye and place it into the already-cut hole in the hull of the boat.
• Apply caulking to the flange of the fitting, and pull the fitting through the hole and against the hull from inside the boat.
• Thread the mono-filament through the locknut or seacock.
• With the fitting pulled firmly against the hull the locknut or the seacock may be screwed onto the fitting.
• Fits GROCO thru-hull fitting sizes from 1/2” through 3”.