second embodiment of the invention in which the winch 40 is eliminated and is replaced by a connecting ring 48 outside the lever housing 25 that is connected to the cable 39 the cable 39 extending outside the lever housing 25 with there being a cable roller 49 inside the lever housing 25 that facilities the pulling of the cable 39 by the connecting ring 48 to operate the mechanism 10 the connecting ring 48 is pulled by an external pulling device such as an underwater vehicle or a cable lowered into the sea from a winch on a ship on the ocean surface fig1 a through 10d show a third embodiment of the invention in which adjacent to the inflatable plug clamp 18 the fluid transfer pipe 12 is cut and connected together by a flexible joint 50 the flexible joint 50 being secured to both pieces of the cut fluid transfer pipe 12 by a pair of joint clamps 51 the purpose of the flexible joint 50 is to enable the inflatable plug assembly 16 to reposition itself inside a pipe p if the inflatable plug assembly 16 is not positioned centrally in the pipe p when it is inserted into the pipe p insertion of the inflatable plug assembly 16 into the pipe p requires that the cut fluid transfer pipe 12 and the flexible joint 50 are held stationary during the insertion and for that purpose there is a collar 52 on the fluid transfer pipe 12 and over the flexible joint 50 and joint clamps 51 the collar 52 abutting against both the joint clamps 51 to minimize movement of the flexible joint 50 the collar 52 has a collar hinge 53 that connects together two collar half sections 54 and opposite the hinge 53.