Groco 3/4 in Bronze Combo Scoop Thru‑Hull — Naval‑Grade Bronze, Low‑Profile Intake Fitting

The GROCO 3/4" Bronze Combo Scoop Thru-Hull w/Nut is a heavy-duty, corrosion-resistant marine intake fitting engineered for secure, low-profile hull penetrations and reliable through-hull performance.

Designed for leisure and workboats where strength and watertight integrity matter, this 3/4" combo scoop thru-hull combines a streamlined exterior scoop with a robust internal nut for positive clamping. Made from naval-grade bronze, the fitting resists electrochemical corrosion and provides a dependable connection point for raw-water pickups, bilge pump discharges, or other onboard systems that require a compact, high-strength thru-hull.

How does the combo scoop design help on typical boats?

The scoop-shaped exterior guides water smoothly into the hull opening while minimizing turbulence and spray when the boat is moving. Its contoured profile reduces snagging and presents a clean, low-drag surface against water flow.

• Streamlined scoop lowers drag and noise at speed.
• Flush-profile exterior reduces fouling and debris catch.
• 3/4" bore suits many common intake hoses and fittings.

What materials and corrosion protections are built in?

GROCO constructs this thru-hull from high-strength bronze alloys chosen for marine environments where saltwater exposure and galvanic action are concerns. The metal’s natural passivation slows dezincification and provides long-term structural integrity when properly installed and isolated from dissimilar metals.

• Naval-grade bronze body resists seawater corrosion.
• Heavy hex nut provides strong clamping force inside hull.
• Recommended to use insulating washers or sacrificial anodes when needed.

How do I install and seal the 3/4" thru-hull correctly?

Installation requires a precise 3/4" hole, appropriate backing, and a marine sealant to ensure watertightness. Tighten the internal nut firmly but avoid over-torquing to prevent hull deformation; follow GROCO’s torque guidelines for best results.

• Drill a clean, accurately sized hull penetration per spec.
• Apply marine-grade sealant to both flange faces before assembly.
• Use a backing plate or reinforced hull area for high-stress applications.

What maintenance keeps this thru-hull performing well?

Periodic inspection and basic care will extend service life: check for corrosion, confirm tightness, and clean marine growth from the exterior. Replace worn hoses and use compatible clamps to preserve the metal-to-metal interface.

• Inspect annually for corrosion or leaks.
• Remove barnacles and debris with a non-abrasive brush.
• Reapply sealant if the joint shows signs of seepage.

Who is this for: Boat owners, shipwrights, and marine technicians seeking a dependable 3/4" thru-hull fitting with a scoop profile and secure internal nut. It’s well suited for small to medium vessels needing a durable intake or discharge point resistant to the rigors of saltwater use, where a compact, reliable solution is required for raw-water systems, washdown lines, or bilge applications.