The quickchange 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 gaskets create a seal in between flanged connections. They offer positive seals and are quick and easy to assemble. Ribbed gaskets keep gasket in place during assembly. 1" and 2" fittings used with these gaskets are rated for pressure to 150 psi at 70F and 3" fittings are rated for pressure to 125 psi at 70F.