EMAIL: sales@boaterstop.com PHONE: 919-951-4313

Free Shipping On All Orders Over $50

GROCO  |  SKU: THT-530-GRO

GROCO Thru-Hull Installation Tool [THT-530]

$135.99 $206.00
Shipping calculated at checkout.

Delivery and Shipping

All orders placed before 3 PM EST ship the same day

We offer multiple shipping options to ensure you get the part you need at a discount.

Best Way -$11.97

Ground -$14.69

2nd Day Air -$25.89

Overnight -$59.99

In addition, we can ship on your account or via a preferred method upon request.

Found a better price? Need faster shipping?

Call or email! 919-951-4313 or sales@boaterstop.com

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"

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Product Categories