The quick - change connections allow you to replace or inspect fittings in seconds as opposed to time consuming threaded liquid handling systems. Easy to use, there is no pipe thread installation, no chance of cross threading, no pipe sealant and no cure time needed. Versatile by nature of the connection - it is easier to redesign, alleviate space constraints and add pieces to your liquid handling system. These clamps are use over two flanged connections that have a gaskets seal in between them. They offer positive seals and are quick and easy to assemble. 1" and 2" fittings used with these clamps are rated for pressure to 150 psi at 70°F and 3" fittings are rated for pressure to 125 psi at 70°F.