The GenTen GT 501 solves the awkward transitions and reduced suction in your vacuum or exhaust system. The GenTen GT501 Eccentric Flush Mount Reducer Adapter is a CUSTOM designed innovative adapter allows you to easily convert 4 inch ports down to a standard 2.5 inch shop vac hose, enabling cleaner, more efficient installations. With its eccentric flush mount design, the GT501 sits nearly flat against walls or surfaces, providing a sleek, professional look. No more ugly gaps or protruding parts! Constructed from durable polymer material, this reducer is built to last and can withstand the rigors of tough environments. Its robust design makes it suitable for reliable use in temperatures up to 95°C (200°F). Whether you're collecting sawdust in your woodshop, ventilating fumes from welding, or controlling the climate in a grow room, the GT501 has you covered. By smoothly transitioning from a larger port to a smaller hose, our adapter optimizes airflow and enhances suction power. You'll notice improved performance across your entire vacuum or exhaust setup. Plus, the GT501 is compatible with a wide range of systems, making it a versatile addition. Upgrade your workspace today with the GenTen GT501 Eccentric Flush Mount Reducer Adapter. With its unique design, sturdy build, temperature resistance, and universal compatibility, it's an investment that will pay dividends in efficiency and aesthetics. Don't settle for mediocre connections - trust GenTen for superior performance!