Click to enlargeGROCO Thru-Hull Installation Tool
Manufacturer: GROCOPart #: THT-530SKU: 75342
- Thru Hull
Item #: 75342
Category: Tools
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Description
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"
Specifications
| Brand | GROCO |
|---|---|
| Part Number | THT-530 |
| EverTide SKU | 75342 |
| UPC | 742985102781 |
| Mount | Thru Hull |
Specifications are provided by the manufacturer. Confirm fitment for your application before ordering, or contact us and we'll help.
Compare similar products
 |  |  |  | |
|---|---|---|---|---|
| Mount | Thru Hull | — | — | — |
| Material | — | Bronze | — | Stainless Steel |
Complete your setup
Returns & warranty
Returns are accepted within 30 dayson items that are unused and in their original packaging. Some items may be subject to a manufacturer restocking fee. Special-order items may not be eligible — if you're unsure, ask us before ordering.
GROCO productscarry the manufacturer's standard warranty. For a warranty claim or a return authorization, see our full returns policy or contact us.
Boat Outfitting — frequently asked
- What material should marine hardware be made of?
- For most exposed hardware, 316 stainless steel is the marine standard — it resists salt corrosion far better than 304 stainless or plated steel. Marine-grade aluminum, UV-stabilized nylon, and King StarBoard are also common for non-structural fittings.
- How do I know a replacement seat or hatch will fit?
- Measure the mounting pattern (bolt spacing), the cutout or base dimensions, and any post diameter or height on the part you’re replacing. Match those to the new part’s specs — outfitting parts follow common sizes but are not universal, so confirming dimensions avoids returns.
- Do I need backing plates for deck hardware?
- For anything that takes load — grab rails, cleats, ladder steps, seat pedestals — yes. A backing plate spreads the load across a larger area of the deck or transom so fasteners don’t pull through under stress.
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