THT-530 - Groco Thru-Hull Installation Tool

Thru-Hull Installation Tool 

Thru Hull Installation Tool

The Concept:

THT-530 makes the installation of standard GROCO thru-hull fittings possible by a single installer.  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.

THT-530 fits GROCO Thru-hull Fitting Sizes from 1/2" through 3"

The GROCO Thru-Hull Installation Tool, part number THT-530, is designed to facilitate the installation of standard GROCO thru-hull fittings. This tool enables a single installer to position and secure thru-hull fittings ranging from 1/2" through 3" in size. It addresses the common challenge of aligning and holding a thru-hull fitting in place while simultaneously attaching a locknut or seacock from inside a boat. The installation process involves sliding the flanged end of the thru-hull fitting onto the tool, guiding it through a pre-cut hull opening using a monofilament line, and then pulling the fitting firmly against the hull. This allows for the subsequent threading of a locknut or seacock onto the fitting, streamlining what would typically require multiple personnel or specialized rigging. This tool is suitable for marine maintenance professionals and boatyards seeking to optimize efficiency in thru-hull fitting installations.