It looks similar to the Moen I recently installed (the former unit was leaking) but it is possible that many models of pull-outs use similar looking connections. You don't mention where it is leaking. If it is at the supply end of the flex hose, check the condition of the o-ring and/or seat washer. Maybe take it into a good hardware store - if it is a name brand, there might be a repair kit. If is the o-ring, you should be able to source a similar-sized replacement.