above carrying the cam 22 and this assembly is adapted to cause relative movement between at least a part of the mobile member 32 and the body 14 containing the air ejector passage to this end the cap 25 is slidable along the body 14 and the lever 23 is articulated to said cap 25 by a pin 49 the cap also includes a straight slot 50 parallel to the direction of movement of the mobile member 32 and the latter has a lateral operating finger 52 passing through said slot the slider can be maneuvered by means of this finger when the lever 23 occupies the position shown in fig2 in this way the appropriate connector may be selected when the lever occupies the position shown in fig3 the mobile member 32 forming the slider is compressed in its housing because of the movement of the cap 25 relative to the body 14 the two parts constituting the slider move towards each other which deforms the elastically deformable sleeves 39 40 as shown in fig3 in particular the deformation of the sleeve 40 of the connector 34 in the 34 use 34 position causes it to firmly grip and seal a valve not shown inserted in the orifice 30 fig4 to 6 show a different embodiment of a connector device 60 mounted directly at the end of a pump cylinder 61 the pump outlet is extended by a body 62 containing the air ejector passage 63 in which a ball check valve 64 is fitted the travel of the ball is limited by an abutment 65 extending axially in.