Abstract: A plate cooler for cooling a fluid made of a plurality of superposed pairs of spaced plates sealed at their margins by side and end plates to form fluid flow channels and connected by lateral plates. The spaced plates and lateral plates are provided with aligned fluid flow openings forming a fluid flow conduit connected to a fluid input and output. The cooler is preferably made of aluminum or an aluminum alloy and is assembled by vacuum welding.

Abstract: Device for connecting tubular conduits with the distributor section or tank (2) of a liquid treatment flow through apparatus (1) provided with treatment elements assembled as a parallelepiped package or core the tank extending over a front surface of the package and provided in a corner section with a cut off triangular section (3) in which there is provided a passage (4) for the liquid, and a substantially pyramidal hollow adapter attachment (6) which may be mounted on the triangular section (3) and which is provided with a base surface having a passage for the liquid corresponding to the passage for the liquid of the triangular section and with a conduit connector opening (9) in one of its side surfaces.