These are compact In-Line Polypropylene BALL VALVES.  They have a very smooth and easy On/Off and flow control action.  Made By GEEKA.

They have a 3/4" BSP thread at each end.  One end is female BSP thread and the other is male BSP thread.  Various attachments of your choice (with 3/4" BSP threads) can then be added to the valve.

These valves are 4 Bar pressure rated.

They measure approximately 80 mm in length (excluding handle overhang) and 60 mm across at the widest point.  The handle length is approximately 50 mm (edge to edge).