The Hymax2 straight coupling, reducing, is a non-restrained pipe coupling for DN40–DN700 that connects two pipe ends with different outside diameters. The coupling suits all pipe materials and works equally well on grey cast iron, ductile iron and PE pipes. The low weight and t-handles allow tightening from above, and the design permits deflection of up to ±4 degrees per side. Before installation, clean the pipe contact surfaces and check the outside diameter with the supplied diameter tape, so that the pipe OD lies within the coupling's working range. The minimum insertion depth is 55 mm for DN40–DN300 and 100 mm from DN350, and half the coupling length is marked on each pipe end. On DN40–DN300, the gasket can be flipped out by hand when the largest span is required. The tightening torque is stated on each coupling and must always be finished off manually with a torque wrench. The gasket withstands −30 °C to +85 °C in continuous operation and up to +100 °C briefly, and the epoxy coating withstands up to +50 °C above ground and up to +65 °C below ground.