placed in the socket before connection ( F16L21/025 take precedence)

Joints with sleeve or socket > with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings > placed in the socket before connection

Joints with sleeve or socket (F16L13/00, F16L17/00, F16L19/00 take precedence; connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics F16L47/00; specially adapted for pipes of brittle material F16L49/00) > with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings (F16L21/06, F16L21/08 take precedence; if adjustability is essential F16L27/00) > placed in the socket before connection ( F16L21/025 take precedence)