Match any tool dust port to any shop-vac or collector hose, with the exact reducer

Woodworking dust ports and shop-vac hoses use a handful of sizes that almost, but never quite, fit each other. A DeWalt miter saw port, a Bosch sander stub, a 2-1/2 inch shop-vac hose and a 4 inch collector hose all measure different outer and inner diameters. Pick your tool and your hose, and get the measured OD and ID of each end, whether they seal, and the named reducer that joins them.