A suggestion for one to avoid
I bought one of these to drain and fill 150l in a 3cx.
Not surprisingly, it needed several cool-down periods as it ran pretty hot (it'd be fine for an engine or gearbox fill).
The in/out barbs are part of the casting (not machined) and show a significant misalignment of the mold halves. This prevents the hose from sealing, so it draws a bit of air on the inlet and weeps on the outlet.
The supplied jubilee clips are so weak they fail before you manage any useful tension.