The monda vege mixer is a little more complex than the standard mix-tap, at the base of the mixer you have 3 inlet holes, H, C & an unmarked one in the centre, H for Hot, C for Cold, unnamed for the long tube thinggy, the copper two-piece thing goes on the end of the long metal tube thinggy, with the head unit hose attached to the bottom of that ... that seems to be the most complex part of it ... although, i've got mine installed and semi-working (i have no hot, but hot water comes out when in the cold on position) ... The monda vege mixer is a little more complex than the standard mix-tap, at the base of the mixer you have 3 inlet holes, H, C & an unmarked one in the centre, H for Hot, C for Cold, unnamed for the long tube thinggy, the copper two-piece thing goes on the end of the long metal tube thinggy, with the head unit hose attached to the bottom of that ... that seems to be the most complex part of it ... although, i've got mine installed and semi-working (i have no hot, but hot water comes out when in the cold on position) ...