Comstar'S Copper Lock Is The Revolutionary & Environmentally Safe Method For Soldering Pipes Designed For The Us Space Program. This Unique Product Instantly Bonds Copper & Brass Pipes/Fitting Without The Use Of Heat Or Metal Solder. Copper Lock Is Great For All Yellow Metals, Copper, Brass Pipe, Fittings, All Refrigerants & Liquids.Simply Apply It Inside The Connector And/Or Onto The Pipe; Making Sure The Liquid Is Totally Around The Circumference, Fit In The Pipe, & Within 60 Seconds A Permanent Leak-Proof Seal Will Prevail. No Heat Or Solder Is Required To Create A Permanent Leak-Proof Bond. Copper Lock Can Seal Copper Pipes Up To 2 Inches (580 Mm). One Of These 2 Ozs Descriptions Still Bonds As Many As 340 3/8-Inch Fittings.Copper Lock'S Patent-Pending Formula Allows For It To Withstand Pressures Of 10,000 Psi Flow And 500 Psi Contained. It Can Also Withstand Temperatures From -60°F To +300°F. It Can Handle Water Systems Pressure Tests In 2 Minutes And A/C System Pressure Tests In 25 Minutes. Copper Lock Can Also Be Disassembled At 400°F Heat And Then Reapplied.Copper Lock Exceeds All Us Military Copper Bonding Specifications: Mil-S-46163A Type I Grade K, Mil-S-224723E Letter Grade Cvv.