A hydraulic and/or pneumatic connector, said connector comprising a fixed part adapted to constitute the end part of a first hydraulic circuit of a main operating machine and to be fixed to said main operating machine, said fixed part comprising at least one first male or female hydraulic coupling, said connector comprising a movable part adapted to constitute the end part of a second hydraulic circuit of a piece of equipment, said movable part comprising at least one second hydraulic coupling, respectively either female or male, wherein said at least one first hydraulic coupling of said fixed part and said at least one second hydraulic coupling of said movable part are adapted to be hydraulically connected so as to achieve the hydraulic connection between said first and second hydraulic circuits of said male operating machine and said equipment, respectively, said connector comprising mechanical constraint means (401, 404) which can be switched between a first position and a second position, wherein the switching of said mechanical constraint means (401, 404) in said second position translates into the mechanical constraining of said fixed part and said movable part and in the hydraulic connection between said first coupling and said second coupling, of said fixed part and of said movable part, respectively, and wherein the switching of said constraint means (401, 404) in said first position translates into the possibility of mechanically releasing said fixed part and said movable part and of hydraulically disconnecting said first coupling and said second coupling of said fixed part and said movable part, respectively, wherein said mechanical constraint means (401, 404) are shaped so as to allow, in said second position, the mechanical releasing of said fixed part and said movable part and therefore the hydraulic disconnection of said first coupling and said second coupling of said fixed part and said movable part, respectively, with no need to be switched in said first position, wherein said mechanical constraint means (401, 404) comprise a lever, which can be switched by rotation, and catching and engaging means, wherein the switching of said lever into said second position translates into the reciprocal progressive engaging of said lever and of said catching and engaging means and into the mechanical constraining of said fixed part and said movable part, wherein said lever defines an engaging surface, wherein the progressive reciprocal engaging of said engaging surface and said catching and engaging means during the switching of said lever into said second position translates into the mechanical constraining of said fixed part and said movable part, wherein with said fixed part and movable part in reciprocal constraining condition and with said lever in said second position said engaging surface is released and not engaged by said catching and engaging means, said lever comprises a plate, wherein said engaging surface is defined by a groove formed in said plate, wherein said groove comprises an end portion, and wherein with said fixed part and said movable part in reciprocal constraining condition and with said lever in said second switching position, said catching and engaging means are positioned at said end portion and may be released from said lever to translate along said end portion, characterized in that it comprises contrasting and checking means accommodated in said end portion of said groove, and in that said contrasting and checking means are fixed to said lever and adapted to contrast the translation of said catching and engaging means along said end portion of said groove and thus the reciprocal releasing of said lever and of said catching and engaging means.