Vetus GRP Tunnel 125 x 750mm

The Vetus GRP Tunnel 125 x 750mm is an essential propeller tunnel component engineered for boats requiring enhanced thrust efficiency and directional control in shallow waters and confined passages. Built by VETUS, a trusted name in marine propulsion engineering, this tunnel serves as the foundation for reliable performance whether you're navigating narrow channels, docking in tight quarters, or operating in waters where conventional shaft arrangements prove impractical. Boaters who demand precise handling and improved low-speed maneuverability rely on properly specified tunnel systems to unlock their vessel's true potential.

Constructed from marine-grade GRP (glass-reinforced plastic), the Vetus tunnel combines corrosion resistance with structural rigidity—critical attributes for components constantly exposed to saltwater and freshwater environments. The 125mm diameter bore accommodates standard shaft diameters while the 750mm length provides optimal flow dynamics and directional stability. GRP construction eliminates rust and galvanic corrosion concerns, reducing maintenance intervals and extending service life compared to metallic alternatives. The tunnel's engineered geometry channels water flow smoothly around the propeller, minimizing cavitation and improving efficiency across throttle ranges.

This tunnel assembly is ideal for stern-drive installations, jet-drive conversions, and custom propulsion retrofits where space constraints or performance requirements demand a dedicated tunnel solution. Weighing 7.5 lbs, it installs without excessive structural reinforcement on most hulls. Proper sizing—matching tunnel diameter and length to your specific engine output and operating profile—ensures optimal efficiency gains. Consult your build documentation or contact a marine engineer to confirm compatibility with your shaft diameter, strut configuration, and mounting points before ordering.