Chem intake is a 5 mm clear pipe with a brass fitting on the end, that pushes into the housing, doesnt' screw. TBH Darran, Im not clued up on these machines, so you need to be pretty basic with me, cars yes, jet washes no lol
There is a green numpty below the water output, I have tried turning it with my hand but it doesn't, so might have to get some water pump pliers on it, and see what happens.