Abstract: A heat exchanger has a fluid flow passage having an inlet and an outlet, and with a first plate and a second plate in opposed facing relation to one another. The fluid flow passage is defined by a space between the inner surfaces of the first and second plates. An electrical heating element is outside the fluid flow passage and adjacent to the outer surface of the first plate, such that heat produced by the electrical heating element is transferred through the first plate to the fluid in the fluid flow passage during use of the heat exchanger. In an embodiment, the first plate has an opening to receive a heater plate component including a first plate portion having an inner surface bonded to a turbulence-enhancing insert and an outer surface bonded to the electrical heating element.

Abstract: A towing coupling to connect a towing vehicle to a trailer, the coupling comprising: a vehicle bar connected to the vehicle; a trailer bar connected to the trailer; an intermediate member adapted to be pivotally connected at a first end thereof to the vehicle bar; and, a releasable member adapted to be releasably and pivotally connected at a first end thereof to a second end of the intermediate member, and to be connected to the trailer bar at a second end thereof; wherein: a first pivot axis is defined by a first coupling arrangement connecting the first end of the intermediate member to the vehicle bar; a second pivot axis is defined by a second coupling arrangement between the intermediate member and the releasable member, the second pivot axis being in a substantially normal direction to the first pivot axis; and a third pivot axis is defined by a third coupling arrangement formed by first and second pivotally connected parts of either the intermediate member or the releasable member, the third pivot axis