ive just setup a system in the back of my van daz
500 litre upright , tap on that goes to pumo box and then outlet to hose reel , all hoze lock fittings apart from the end of my 8mm microbore got a ez snap end tap , which is what you mean by rectus 21 i think
order the hose reel from pure freedom, 100m and reel, they are sturdy enough and easy to use, they have a hoselock inlet and your 8mm microbore just gets jubilee clipped ton the outlet