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Series 65 Radiator Supply Valves are used as positive manual shutoffs in two-pipe steam or forced circulation hot/chilled water systems. They feature a brass body with threaded-male union connection, non-rising stem, heavy-duty packing spring and phenolic handle. Available in straightway pattern (SW-65) or angle pattern (AP-65). Steam Pressure Operating Range: 25 in. Hg. vacuum to 60psi (4.2 bar), Water Pressure Operating Range: 0 to 60psi (4.2 bar).