A coupling for joining two pipes having end sections, each of which is provided with a circumferential locking rib and can be inserted into the coupling, wherein the coupling has at least one elastic ring that joins at least two elongated webs, and wherein the coupling has stop projections, which lock...http://www.google.com/patents/US7909369?utm_source=gb-gplus-sharePatent US7909369 - Coupling for joining two pipes
