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Place the Italian sausage links, spaghetti sauce, green pepper and onion into a slow cooker. Stir to coat everything in sauce. Cover, and cook on Low for 6 hours. Serve on hoagie rolls.
Arrange 2 pounds of Italian sausages over the mixture, browned first if desired. To brown, use a heavy skillet over high heat and cook the sausages, turning often, for about eight minutes. After arranging the sausages over the vegetable mixture, put the baking dish in an oven at 350 F and allow to bake for 45 minutes.