Super handy swivel G1/4" extension, with a 45 degree angle.
You screw this piece into the block, reservoir or radiator and into this piece you screw your desired fitting.
You can also rotate this piece around its axis!
This way, you can easily connect blocks, reservoirs and radiators with a hose!
Or can you not screw your beautiful screw fitting into your block due to lack of space? Then this piece is also the solution!