Add to cart Copper Lock – 50ml Copper Lock is revolutionizing the way pipes are soldered. Simply apply it inside the connector, fit in the pip and within seconds a permanent leakproof seal will occur. Pressure may be applied after 2 minutes. Can withstand pressures at 10,000 PSI flow and 500 PSI contained. Copper Lock can also withstand temperatures from -60◦F to + 300◦F