Installation fittings for use with induction weldable pipe connectors for assembling multi-layer pipe fluid distribution systems. Induction welding pipe connectors including a major central pipe connector section and a minor lateral pipe connector section pair having reduced thickness relative to the major central pipe connector section. Induction welding pipe connectors with 5 integral solder flow barrier for assembling fluid distribution systems. Electromagnetic induction coil reverse action pliers for use with induction weldable pipe connectors for assembling fluid distribution systems.

A fitting holder designed for receiving a branch pipe during a welding operation in order to attach the branch pipe to a pipeline or a pipe, wherein differently dimensioned branch pipes can be received by the fitting holder, comprising a hollow-cylindrical housing with an upper region which, during the welding, faces away from the pipeline to be welded thereto, and a lower region which, during the welding, faces the pipeline to be welded thereto, wherein mounts for the axial fixing of the branch pipe which can be received by the fitting holder are arranged in the lower region, a ring arranged displaceably in the housing, and clamping elements pressing the ring downwards, wherein the fitting holder has different guide inside diameters which guide the differently dimensioned branch pipes by way of their differently dimensioned outside diameters in the fitting holder.

A nasal/oral cannula for collecting a flow of exhaled gases and its method of manufacture are disclosed. The cannula comprises an elongated tubular body having a first and a second end portion, a surface and an internal volume; a wall internally disposed within said tubular body, said wall defining a first subvolume of said internal volume in the lengthwise direction of the tubular body; and an inlet through said surface, for introducing exhaled gases into said first subvolume. The first end portion defines an exit port for exhaled gases from said subvolume, and said wall is arranged directly adjacent to said inlet.