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The side plug d.280 sleeve 1-1/2" is a specialized fitting used to seal or cap openings in boiler and burner systems. With a diameter of 280 and a 1-1/2 inch sleeve, this plug is designed to fit specific ports, preventing leaks and maintaining system pressure. Ideal for maintenance tasks, it helps secure connections and protect internal components from debris. Whether you are repairing a gas burner or servicing a heating unit, this side plug offers a reliable solution for closing off unused or access points.