Abstract: This invention relates to a pumping system. The design of the system is such that bi-directional operation can be achieved using a significantly smaller and hence lighter unit than those currently available. It uses the direction of rotation of the drive shaft to control the opening and closure of the by-pass means for controllably returning the fluid to the first reservoir.

Abstract: A terminal insulator comprising a tubular component formed from flexible insulating material. In one axial region the wall of the component is formed with slits which define a displaceable flap integral with the remainder of the component. The flap is such that displacement thereof produces in said axial region of the component an aperture, the remainder of said region defining a shroud. The component further includes an additional axial region which is unaffected by said slits and so defines an unbroken collar. A method of manufacturing such a terminal insulator and a terminal assembly utilising such an insulator are also disclosed.