Pipe Freezing Unit Material Application Copper Steel Freezing Method Compressor Minimum Copper Tube Size 1/2 in Maximum Copper Tube Size 2 1/2 in Minimum Steel Pipe Size 1/2 in Maximum Steel Pipe Size 2 in Maximum Freeze Duration 10 to 15 min Time to Freeze As Little as 6 min Voltage 115 V Compressor Type Rotary Container Type Case Current 2.4 A Features Easy-to-Use Pipe Freezing Mini-Refrigeration Unit That Circulates Self-Contained Refrigerant Freeze Head Material Aluminum