Just For Copper Solderless Copper Bonding - Easy to use, permanent cold weld for installing and repairing rigid copper pipe in potable hot and cold water (also safe for gas application). Just For Copper provides the same permanent weld as hot solder. Design for use on pipes up to 2" diameter in a range of 40 degree F to 248 degree F. Pressure rated to 500 psi Bonds even if pipes are wet Bonds in 70% less time than soldering Visible dye for inspections