Groco Bronze Thru-Hull Fitting with Nut

The Groco Bronze Thru-Hull Fitting with Nut is a marine-grade bronze through-hull fitting. It gives you a secure, watertight hull penetration for seawater intake, cooling water, bilge discharge, and other below-the-waterline or above-the-waterline plumbing runs. Each fitting comes with its matching bronze locknut. It can also be threaded directly into a compatible Groco seacock.

Key Features:

• Marine bronze construction: Cast from C83600 bronze for corrosion resistance in saltwater.
• UL Listed 647B: Built to a recognized standard for marine through-hull fittings.
• Includes locknut: The -W version comes with a nut. The locknut has a bonding screw.
• Flanged design: The solid flange seats against the hull and gives a stable mounting surface.
• Seacock compatible: Pairs with Groco seacocks and ball valves for a complete, serviceable hull penetration.

Installation Notes: Cut the threaded portion to a suitable length for the hull and backing block thickness. Allow for thread depth when mounting a seacock. Apply marine sealant between the hull and the thru-hull flange.

Groco is a long-established name in marine plumbing. This fitting suits sailboat and powerboat owners who want a durable thru-hull for new installations or replacements.