UL221 Unloader ValveSPECK UL221 Unloader Valve. Available in 3 different pressure ratings. Part no MODEL L MIN BAR GPM PSI 00. 0639 UL221 100 50 100 11. 0 1450 00. 0640 UL221 140 50 140 11. 0 2030 00. 0817 UL221 200 50 200 11. 0 3045 Min Flow Rate 5 litre min Water Temperature Max. 70C Construction Characteristics Ball Kick Back Valve, Taper Kick Back Valve or Plate Kick Back Valve. Casing of Brass. Interchangeable Stainless Steel Valve Seats. Connections for Manometer,
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