Sprinkler riser connecting apparatus including a connector having a first generally cylindrical hollow sleeve adapted to be mounted in a fixed secure relationship to a vertically extending stake extending upwardly from the ground. A split sleeve is connected to the hollow sleeve having a throughbore...http://www.google.fr/patents/US5687910?utm_source=gb-gplus-shareBrevet US5687910 - Sprinkler riser connecting apparatus
