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The 1/2" NPT(F) inlet/outlet ports allow hookup to a variety of external equipment such as electron microscopes, diffusion pumps, AA furnaces, and mass spectroscopy systems. Recirculators include male pipe adapters with barbed fittings for 1/2" ID tubing, 10-ft of reinforced PVC tubing, and 5-ft power cord; 120 VAC models also include a three prong plug.